The battle of the six-packs is on in our 2010 Shirtless Bracket. Zac Efron and Spencer Pratt are going head to head in round one, and while the Charlie St. Cloud actor is in the lead, Spencer somehow manages to have some votes! We also took a look at five hot and close matchups from day one of the competition. Do you need an excuse to check out the celebrity ab-show? Well, we have that — one lucky voter will also win these awesome Tom Ford sunglasses! They're the perfect accessory to scope out sexy men all Summer long. 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!