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Michael Phelps

Olympian Michael Phelps, 27, heated up the London Summer Games this year thanks to his stellar swimming, but he still managed to keep things hot and heavy out of the pool with new girlfriend Megan Rossee. Though the two have been dating since January, the couple waited until the games to debut their relationship. And did we mention she's a 25-year-old aspiring model. Who needs a gold medal when you've got that to walk around with? (8/6/2012)

Hot and cold celeb couples of summer

Some stars spent the summer taking their relationship to the next level, while others went their separate ways. – By Lizbeth Scordo and Raechal Leone Shewfelt, omg! staff