EX-5.1

Exhibit 5.1

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601 Lexington Avenue

New York, NY 10022

United States

+1 212 446 4800

www.kirkland.com

Facsimile:

+1 212 446 4900

December 2, 2020

Oaktree Acquisition Corp.

333 South Grand Avenue, 28th Floor

Los Angeles, California 90071

Ladies and Gentlemen:

We have acted as special legal counsel to Oaktree Acquisition Corp., a Cayman Islands exempted company (“OAC”), in connection with the Registration Statement on Form S-4, initially filed with the U.S. Securities and Exchange Commission (the “Commission”) on October 23, 2020, as amended and supplemented through the date hereof, pursuant to the Securities Act of 1933, as amended (the “Act”) (such Registration Statement, as amended or supplemented, is hereafter referred to as the “Registration Statement”), relating to the Agreement and Plan of Merger, dated September 30, 2020 (the “Agreement and Plan of Merger”), by and among OAC, Rx Merger Sub, Inc., a Delaware corporation (“OAC Merger Sub”), and Hims, Inc., a Delaware corporation (“Hims”). Pursuant to the Agreement and Plan of Merger, OAC will change its jurisdiction of incorporation from the Cayman Islands to Delaware (the “Domestication”) pursuant to Part XII of the Companies Law (Revised) of the Cayman Islands and domesticate as a Delaware corporation in accordance with Section 388 of the General Corporation Law of the State of Delaware (the “DGCL”) by filing a certificate of corporate domestication simultaneously with a certificate of incorporation, in each case in respect of OAC with the Secretary of State of the State of Delaware (the “Delaware Secretary of State”). The Domestication is subject to the approval of the shareholders of OAC. We refer herein to OAC following effectiveness of the Domestication as “New Hims.”

Promptly following the consummation of the Domestication, OAC Merger Sub will merge with and into Hims (the “Merger” and together with the Domestication and related transactions, the “Business Combination”), with Hims as the surviving company in the Merger and, after giving effect to the Merger, Hims will be a wholly-owned subsidiary of OAC (the time that the Merger becomes effective being referred to as the “Effective Time”). In connection with the Domestication, on the date of closing prior to the Effective Time, (i) each issued and outstanding Class A ordinary share, par value $0.0001 per share, of OAC (the “Class A Ordinary Shares”) and each issued and outstanding Class B ordinary share, par value $0.0001 per share, of OAC (the “Class B Ordinary Shares”) will convert automatically by operation of law, on a one-for-one basis, into shares of Class A common stock, par value $0.0001 per share, of New Hims (the “New Hims Class A Common Stock”); and (ii) each issued and outstanding whole warrant of OAC to purchase Class A ordinary shares of OAC (the “Warrants”) will automatically represent the right to purchase one share of New Hims Class A Common Stock at an exercise price of $11.50 per share on the terms and conditions set forth in the warrant agreement, dated July 22, 2019, between OAC and Continental Stock Transfer & Trust Company, as warrant agent (the “Warrant Agreement”).

This opinion is being rendered in connection with the registration under the above-referenced Registration Statement of (i) 23,898,437 shares of New Hims Class A Common Stock, representing (a) 20,125,000 Class A Ordinary Shares and (b) 3,773,437 Class B Ordinary Shares, (ii) 9,720,833 shares of New Hims Class A Common Stock to be issued upon the exercise of Warrants (the “Warrant Shares”) and (iii) 9,720,833 Warrants.

Oaktree Acquisition Corp.

Page 2

In connection with the preparation of this opinion, we have, among other things, read:

(a)

a copy of the Agreement and Plan of Merger, filed as Exhibit 2.1 to the Registration Statement;

(b)

the Registration Statement;

(c)

the form of proposed certificate of incorporation of New Hims, to be filed with the Delaware Secretary of State (the “Certificate of Incorporation”), in the form filed as Exhibit 3.2 to the Registration Statement;

(d)

the form of proposed Bylaws of New Hims, to be adopted by New Hims in connection with the Domestication (the “Bylaws”), in the form filed as Exhibit 3.3 to the Registration Statement;

(e)

the form of proposed certificate of corporate domestication of OAC, to be filed with the Delaware Secretary of State (the “Certificate of Domestication”), in the form filed as Exhibit 4.5 to the Registration Statement;

(f)

a copy of the Warrant Agreement, filed as Exhibit 4.1 to the Current Report on Form 8-K filed by OAC on July 23, 2019;

(g)

a copy of the specimen warrant certificate, filed as Exhibit 4.3 to the Registration Statement on Form S-1 filed by OAC on July 16, 2019; and

(h)

such other documents, records and other instruments as we have deemed necessary or appropriate in order to deliver the opinions set forth herein.

For purposes of this opinion, we have assumed the authenticity of all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies and the authenticity of the originals of all documents submitted to us as copies. We have also assumed the legal capacity of all natural persons, the genuineness of the signatures of persons signing all documents in connection with which this opinion is rendered, the authority of such persons signing on behalf of the parties thereto and the due authorization, execution and delivery of all documents by the parties thereto (other than OAC with respect to the laws of the State of New York). We have not independently established or verified any facts relevant to the opinion expressed herein, but have relied upon statements and representations of officers and other representatives of OAC and others as to factual matters.

Subject to the assumptions, qualifications, exclusions and other limitations, which are identified in this opinion, we advise you that:

Upon (i) the effectiveness of the Domestication and (ii) the filing of the Certificate of Incorporation with the Delaware Secretary of State, the issued and outstanding Class A Ordinary Shares will automatically convert by operation of law, on a one-for-one basis, into duly authorized, validly issued, fully paid and non-assessable shares of New Hims Class A Common Stock.

Upon (i) the effectiveness of the Domestication and (ii) the filing of the Certificate of Incorporation with the Delaware Secretary of State, the issued and outstanding Class B Ordinary Shares will automatically convert by operation of law, on a one-for-one basis, into duly authorized, validly issued, fully paid and non-assessable shares of New Hims Class A Common Stock.

Upon (i) the effectiveness of the Domestication, (ii) the filing of the Certificate of Incorporation with the Delaware Secretary of State and (iii) the exercise by the holders of Warrants and the payment of the exercise price for the Warrant Shares pursuant to the Warrant Agreement, the Warrant Shares will be duly authorized, validly issued, fully paid and non-assessable.

Oaktree Acquisition Corp.

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Upon (i) the effectiveness of the Domestication and (ii) the filing of the Certificate of Incorporation with the Delaware Secretary of State, each issued and outstanding Warrant will be a valid and binding obligation of New Hims, enforceable against New Hims in accordance with its terms under the laws of the State of New York.

In addition, in rendering the foregoing opinions we have assumed that:

OAC (i) is duly incorporated and is validly existing and in good standing, (ii) has requisite legal status and legal capacity under the laws of the jurisdiction of its organization and (iii) has complied and will comply with all aspects of the laws of the jurisdiction of its organization in connection with the transactions contemplated by, and the performance of its obligations under, the Warrant Agreement;

OAC had the corporate power and authority to execute and deliver, and has the corporate power and authority to perform all of its obligations under the Warrant Agreement;

the performance by OAC of its obligations under the Warrant Agreement: (i) does not constitute or will not constitute a violation of, or a default under, any lease, indenture, instrument or other agreement to which OAC or its property is subject, (ii) does not contravene or will not contravene any order or decree of any governmental authority to which OAC or its property is subject, and (iii) does not violate or will not violate any law, rule or regulation to which OAC or its property is subject (except that we do not make the assumption set forth in this clause (iii) with respect to the laws of the State of New York or the DGCL); and

the performance by OAC of its obligations under the Warrant Agreement does not require or will not require the consent, approval, licensing or authorization of, or any filing, recording or registration with, any governmental authority under any law, rule or regulation of any jurisdiction;

prior to effecting the Domestication and prior to the issuance of securities by New Hims: (i) the shareholders of OAC will have approved, among other things, the Domestication; and (ii) all other necessary action will have been taken under the applicable laws of the Cayman Islands to authorize and permit the Domestication, and any and all consents, approvals and authorizations from applicable Cayman Islands governmental and regulatory authorities required to authorize and permit the Domestication will have been obtained; and

the current draft of the Certificate of Incorporation, in the form thereof submitted for our review, without alteration or amendment (other than identifying the appropriate date), will be duly authorized and executed and thereafter be duly filed with the Delaware Secretary of State in accordance with Section 103 of the DGCL, that no other certificate or document, other than the Certificate of Domestication as required under Section 388 of the DGCL, has been, or prior to the filing of the Certificate of Incorporation will be, filed by or in respect of OAC with the Delaware Secretary of State and that OAC will pay all fees and other charges required to be paid in connection with the filing of the Certificate of Incorporation.

Our opinions expressed above are subject to the qualifications that we express no opinion as to the applicability of, compliance with, or effect of (i) any bankruptcy, insolvency, reorganization, fraudulent transfer, fraudulent conveyance, moratorium or other similar law or judicially developed doctrine in this area (such as substantive consolidation or equitable subordination) affecting the enforcement of creditors’ rights generally, (ii) general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law), (iii) an implied covenant of good faith and fair dealing, (iv) public policy considerations which may limit the rights of parties to obtain certain remedies, (v) any requirement that a claim with respect to any security denominated in other than U.S. dollars (or a judgment denominated in other than U.S. dollars in respect of such claim) be converted into U.S. dollars at a rate of exchange prevailing on a date determined in accordance with applicable law, (vi) governmental authority to limit, delay or prohibit the making of payments outside of the United States or in a foreign currency or currency unit and (vii) any laws except the laws of the State of New York and the DGCL. We advise you that issues addressed by this letter may be governed in whole or in part by other laws, but we express no opinion as to whether any relevant difference exists between the laws upon which our opinions are based and any other laws which may actually govern. We do not find it necessary for the purposes of this opinion, and accordingly we do not purport to cover herein, the application of the securities or “Blue Sky” laws of the various states to the issuance of the Securities.

Oaktree Acquisition Corp.

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This opinion is limited to the specific issues addressed herein, and no opinion may be inferred or implied beyond that expressly stated herein. We assume no obligation to revise or supplement this opinion should the present laws of the State of New York or the DGCL be changed by legislative action, judicial decision or otherwise. We hereby consent to the filing of this opinion with the Commission as Exhibit 5.1 to the Registration Statement. We also consent to the reference to our firm under the heading “Legal Matters” in the Registration Statement. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission.

Very truly yours,

/s/ KIRKLAND & ELLIS LLP