Cameron Diaz, Gwyneth Paltrow, Ben Affleck and more! See the seemingly ageless A-listers celebrating 40th birthdays this year
Cameron Diaz (August 30)
Who's afraid of the big 4-0? Not Cameron Diaz (seen here in January 1995). The blonde beauty, who turned 40 August 30, told InStyle in May that "Life gets better as you get older, definitely . . . I feel better than ever: stronger, more capable and clearer. I really know myself now."