PIX: The 20 hottest bikini bodies under 25!

Who are the sexiest sirens in a two-piece? We bring you a list compiled by RadarOnline.com!

They're young, they're hot and they've got the best bods in the world!

Here's a look at female celebrities under the age of 25 who are always beach-ready, as per a list compiled by website RadarOnline.com

Megan Fox

The 24-year-old starlet's latest releases have bombed bigtime at the box office, but she is undeniably a bombshell!

Drama queen Lilo's life has been a trainwreck in recent months, but the same can't be said of her tanned, toned bod.

The Disney actress is only 18, but in fantastic form!

The 23-year-old Gossip Girl blonde has great curves.

Tennis ace Sharapova's athletic abs and great tone at 23 are enviable for sure!

The American socialite-model-actress just turned 25 last month, but she still qualifies!

Twenty one-year-old Heroes star Hayden is just hot!

The Jersey Shore starlet loves to flaunt her bod in skimpy outfits.

Wrestler Hulk Hogan's baby girl has a killer bod -- must be in her genes!

Svelte Hilary is already married at 23 -- we're not surprised!

This 22-year-old brunette stunner claims she is addicted to junk food -- doesn't look it, though!

The Barbadian beauty, 23, is as curvy as they come!

Like Selena, Miley's only 18, but this teen sure looks tantalising!

The The Hills actress, 24, could have any man climbing mountains for her!

Now here's a beauty with brains! Style icon Emma is only 20.

Bulgarian-Canadian actress Nina of The Vampire Diaries fame is in terrific shape.

Country cutie Taylor goes straight to sizzling hot whenever she shows off her figure.

The 23-year-old star of 90210 is a slimline siren.

Twilight's Ashley is 24 and she's more vamp than vampire!

And rounding off the list is Ashley's co-star Kristen, 20 -- no wonder she's captured hunk Pattinson's heart!