Stars' Summer Lovin'

Check out the hottest celebrity romances of the season (including The O.C.'s Mischa Barton and beau Brandon Davis). By Serena Kappes with Laura J. Downey

LINDSAY LOHAN & WILMER VALDERRAMA

Lohan, 18, wasn't about to make the first move with That 70s Show's Valderrama, 24: "A girl should never do that," says the Mean Girls star (cuddling with her man in Miami). It wasn't until Lohan's 18th birthday bash on July 2 at the Hollywood nightclub Avalon that the couple, first spotted together in May, went public with their romance.