- Billy and Claire Danes ended their three-year romance after splitting just before Christmas in 2006.
- Billy declined an offer to play Bruce Banner in Hulk (2003).
- Billy has one son.
- As of 2004, Billy is dating Claire Danes.
- Billy loves to play golf.
- Billy has two brothers.
- Billy has a Master's in Fine Arts.
- He's the voice behind the "...Priceless" series of MasterCard commercials.
- Billy Crudup: I wish I could say that when I didn't agree with a director I defer to him, but I think sometimes I'm a little self-righteous.
