Jennifer Aniston and Brooklyn Decker are currently going head to head — or more appropriately swimsuit body to swimsuit body — in the finals of our 2010 Bikini Bracket! Jennifer has a slight lead over the supermodel, though it's still anyone's championship to earn. The Just Go With It costars are also friends in real life, and we're taking a look back at their fantastic beachy figures through the years. Make your final pick for a chance to win an iPhone 4 — remember, you must be logged in to be entered; see the official rules here — and help us crown our 2010 two-piece queen. Vote now and check out some of Brooklyn and Jennifer's hottest bikini pictures ever!