Mena Suvari stripped down to her tiny bikini to go jet-skiing in Mexico yesterday. She showed off a tattoo of the number 13 on her chest, matching her fiancé Simone Sestito. Mena is just one of many gorgeous ladies we've seen in a swimsuit this year — be sure to fill out our newest bracket and vote on the hottest bikini body of 2009 to win an iPhone!

To see more photos of Mena in her bikini just