Born: Dec. 19, 1980
Hometown: Los Angeles
Gyllenhaal was born into a showbiz family -- his dad is a TV and movie director, his mom is a screenwriter and big sister Maggie is a Golden Globe-nominated actress. He made his acting debut in "City Slickers" in 1991 with a small role as Billy Crystal's son. Following a couple other small roles as a kid, he turned to acting full time after finishing high school. His first big role came in the 1999 movie "October Sky."