Were they born beautiful, or did they have a little nip/tuck on their way to Hollywood stardom?

Most stars won't tell if they've had work done, but others aren't shy about showing off their "enhancements."

Like Carmen Electra and Heidi Montag (or Heidi Pratt or whatever she's calling herself these days.

Check out our photo gallery of sexy stars who've gone under the knife, and are proud of the results.

PHOTOS: Surgically enhanced celebrity bikini bodies.

More Celeb Bikini Fun

PHOTOS: Cutest Hollywood bikini moms.

PHOTOS: Over-40 celebrity bikini bodies.

PHOTOS: Stars' favorite 2009 bikini styles.

PHOTOS: Full-figured stars' bikini bodies.

VIDEO: Sports Illustrated swimsuit model Bar Refaeli unveils her "little black bikini."