Chelsea Clinton Getting Her Bod Bikini Ready

Chelsea Clinton is ready for bikini season.

Sources say the former first daughter has become a near-constant spin class fixture at the new SoHo outpost of Ride the Zone.

"It's funny," our spy tells us. "She's sweet as pie when she arrives, but the minute she gets on the bike, she's suddenly really focused and intense."

PHOTOS: 2009's celebrity bikini favorites.

All the hard work is paying off, because Chelsea "looks amazing."

We're sure her longtime beau, Marc Mezvinsky, appreciates her fit form.