AGE 24: Taylor Swift

Singer/actress

What makes her powerful: T-Swift may only have a small role in Hollywood, acting-wise, but she's got a big one in the who's-dating-who world of red carpet gossip. Jake Gyllenhaal is a former beau of Swift's, as are Zac Efron, Taylor Lautner, and Lucas Till.

But her popular music, nominated twice now for Best Original Song in a Motion Picture, is a hot commodity for TV and film.