Welcome to the Bikini Bracket sweet 16! Diane Kruger, Katy Perry, Halle Berry, Jennifer Aniston and more have made it this far — who are you going to choose? The battle of the models is already heating up between last year's champion, Bar Refaeli, and Brooklyn Decker. For the month of July, we're narrowing 64 finalists down to number one in a competition of who has the hottest celebrity bikini body. All you have to do now is place your third-round picks, and we'll be posting updates on the action. Here's the best part — one lucky voter will also win a brand-new iPhone 4! You will be entered for each round you complete, so the more rounds you play, the more chances you have to win. Remember, you must be logged in to be entered. See the official rules and click here to get started — happy voting!