Foster starred as Nurse Fay Apple in the New York City Center's Encores! production of "Anyone Can Whistle", which played from April 8 to April 11, 2010. Foster made her Off-Broadway debut in Paul Weitz's comedy "Trust" with Zach Braff, Bobby Cannavale and Ari Graynor which began previews July 23, 2010 with an official opening August 12, running through September 12, 2010 at Second Stage Theatre. Foster and Seth Rudetsky participated in the one night only Actors Fund benefit concert version of "They're Playing Our Song" on August 30, 2010 at the Gerald W. Lynch Theater, John Jay College, New York. The full cast included Efé, Kaitlyn Davidson, Alex Ellis, Maynard, Matt Loehr, and Jesse Nager, and was directed by Denis Jones.