Best friends forever! It's official: Jennifer Aniston will guest star on the season premiere of Courteney Cox's sitcom Cougar Town on Wednesday, September 22 (9:30 p.m. ET). It's the first time the real-life pals have teamed up on-screen since a 2007 episode pf Courteney's drama Dirt, when Jen played a rival tabloid editor who shared a much-discussed lip-lock with Courteney's character. Hopefully, the episode fares better then Jen's movie The Switch, which disappointingly debuted at No. 8 this weekend.