Clad in a floor-length black Tom Ford gown as she mingled with famous pals like Salma Hayek and Cameron Diaz - on the arm of Theroux, Aniston risked a nip slip in the daring design.

At one point, Aniston made her best "Awww" face as she presumably checked out pictures of Drew Barrymore''s new baby, Zimbio reported.

Jennifer Aniston. Pic/Santa Banta