We already knew that Selena Gomez won Justin Bieber's heart with her beauty, brains and talent, but once the singer flaunted her head-turning bikini body in Florida earlier this week, we realized there's another reason that Bieber is so smitten with Gomez, and that's her rock-hard body.

We'll just say, Gomez looks absolutely flawless in a bikini ... Like girl-should-be-a-Victoria's-Secret-model flawless.

It's already hot as heck in Florida, but our gal Selena made the mercury rise several notches when she stripped down. The Biebs better keep a watchful eye on his gal pal, because she is looking mighty fine and the whole world is watching!

The 'Who Says' singer caught some rays by the pool while relaxing at her luxury hotel in Orlando, Florida on July 29, since she was in town for the start of her summer tour. A busy popstar needs a little downtime and what better way to do it than by catching some rays by the pool in a killer pink-striped bikini?

Celebuzz posted a whole gallery of photos of Gomez in her bikini, showing off that fit-and-in-fine-form bod of hers. Fresh off her 19th birthday, Gomez is living proof that it's good -- make that very good -- to be young, beautiful and famous. Oh, Selena Gomez, how we'd love to be you, even if only for day! You have got the life!

Watch the Selena Gomez 'Who Says' Video'