Casey Affleck

Born Aug. 12, 1975, in Falmouth, Mass., Ben Affleck's baby brother, Casey, has become a star in his own right, appearing in the blockbuster Ocean's Eleven (and its sequels) and with Brad Pitt in 2007's The Assassination of Jesse James (for which he earned his first Oscar nomination for Best Supporting Actor).

The younger Affleck -- who studied physics at New York's Columbia University -- made his small-screen debut opposite Kevin Bacon in the 1988 American Playhouse presentation "Lemon Sky." But it was Affleck's performance as a disaffected youth in director Gus Van Sant's To Die For (1995) that attracted critics' and moviegoers' attention and put the young actor on the Hollywood map.

Affleck has continued to make his mark, with roles in Drowning Mona, Committed, Soul Survivors and Ben Affleck's Gone Baby Gone.