TRUE RELIGION APPAREL, INC.

Exhibit 10.18

TRUE RELIGION APPAREL, INC.

February 26, 2013

Lynne Koplin

Re: Amendment to Employment Agreement

Dear Ms. Koplin:

Reference is made to that certain Employment Agreement, dated December 16, 2009, by and between Lynne Koplin (“you”) and True Religion Apparel, Inc. (the “Company”), as amended on August 13, 2010, October 27, 2011, September 28, 2012, and November 2, 2012 (the “Agreement”).

The Company and you hereby agree to amend Section 3 of the Agreement to provide that Executive’s employment shall be for a term ending on June 1, 2013 (the “Initial Termination Date”)”.

The intention of this letter agreement is to extend the initial term of the Agreement through June 1, 2013. All other terms and conditions of the Agreement shall remain in full force and effect. Therefore, following execution of this letter agreement, you shall maintain your title and authority as President of the Company and you and the Company shall be expected to continue fulfilling all of your and our respective duties and responsibilities in accordance with the Agreement. You acknowledge that the Company cannot provide any assurances at this time as to whether it will extend the term of the Agreement or elect not to so extend. You represent and warrant to the Company that you have had an opportunity to review this letter agreement with independent legal counsel, and have executed this letter agreement based upon your own judgment and advice of your independent legal counsel.

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IN WITNESS WHEREOF, the undersigned have executed this letter agreement as of the date first written above.