Jennifer Aniston opened up about turning 40 on Ellen DeGeneres' show as the two visited on the set of Friends and shared birthday cake. "I feel better than I ever felt in my life," Aniston said, whose birthday is on Feb. 11. "I did have a moment, though, over the weekend. My first, like, 'Huh, … I don’t want to [turn 40].' I found a really long gray hair and it kind of flipped me out. It’s not my first but it’s the fact that it was so long." (Photo: WENN)