By James Hibberd
Updated September 13, 2011 at 08:49 PM EDT
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NBC’s new comedy Free Agents is getting a visit from veteran comic Rachael Harris.

Harris has been cast in a two-episode arc on the freshman series, which follows two newly single PR coworkers Alex and Helen (Hank Azaria and Kathryn Hahn) who embark on an ill-advised one night stand. Harris will play the sister of Helen’s late fiance on the show. Edith asks Helen to be her child’s godmother despite the two having radically different parenting ideas.

In addition to The Hangover, Harris has been in Modern Family, Diary of a Wimpy Kid and Party Down. Free Agents gets a jump on the next week’s big premiere land rush by debuting tomorrow night at 10:30 p.m. after the premiere of Up All Night before returning to its regular 8:30 p.m. time period next week (fall premiere dates here).