Blake and Penn were first linked in 2007, during the first season of their hit teen soap "Gossip Girl." But the co-stars denied their romance -- at least until they were snapped getting seriously steamy during a vacation in Mexico. Two years later, their off-screen romance went the way of their on-camera counterparts, and the couple split. Since their 2010 breakup, the duo have continued working together on "Gossip Girl." When Blake wed Ryan Reynolds in September 2012, Penn had only the best to say for his former leading lady. "I'm happy for her, genuinely happy," he told Us Weekly.