I actually found one famous (well, semi-famous) person born on the exact same day as me (March 15, 1980): Freddie Bynum of the Baltimore Orioles.
Other famous people born on March 15th (in no particular order):
Eva Longoria (1975)
Will.I.Am of the Black Eyed Peas (1975)
Young Buck (1981)
Kevin Youkilis of the Red Sox (1979)
Mark Hoppus of Blink 1982 (1972)
Kim Raver of 24 (1969)
Robert Fick of the Washington Nationals (1974)
Mark McGrath of Sugar Ray/Extra TV show (1968)
Bret Michaels of Poison (1963)
Harold Baines, White Sox legend (1959)
Dee Snider (1955)
Bobby Bonds, the late father of Barry (1946)
Judd Hirsch of Taxi (1935)
You can see the rest here...