Our 2010 Bikini Bracket is underway! It's so hard to choose between Hollywood's hottest bodies and since all the ladies look so fantastic in their two-piece suits it really could be anyone's game. We're upping the ante by giving away a sexy iPhone 4 to one lucky voter, so make sure to fill out your bracket every round to have more chances to win. Day one had some surprising outcomes for us, but there's still a few days before the winners advance so who knows what's in store - check out which matchups are closest after the first 24 hours of voting and be sure to weigh in with all your picks!