EXCLUSIVE: NBC is making a casting change on Undateable, its multicamera comedy pilot from Bill Lawrence and Warner Bros TV. Aly Michalka has departed the project, which is taping Thursday. I hear she will be replaced with Briga Heelan, who last month was cast as the female lead of another Bill Lawrence/Warner Bros TV multi-camera comedy pilot, TBS’ Ground Floor. Because of her relationship with the producers, Heelan has been able to quickly step into Undateable, in which she is being cast as a guest star because of her existing commitment to Ground Floor. (Undateable will actually film before the TBS pilot.)

Written by Adam Sztykiel based on the book by Ellen Rakieten & Anne Coyle, Undateable is described as a bromantic comedy about Danny (Chris D’Elia) and Justin (Brent Morin) — two very different guys who are bonded by their common inability to attract women. Heelan, repped by Gersh and Thruline, will play Maddie, a waitress in Justin’s (Morin) bar who is endlessly attracted to jerks and bad pickup lines … but could she have a sweet spot for Justin? NBC has been aggressive with recastings this season. Last year, Michalka also exited a comedy pilot, Fox’s Rebounding.