News Seth Rogen Has a Crush On Who? By Concetta DeLuco 2:53 AM PDT, May 2, 2013 Getty Images Funnyman Seth Rogen says he's been crushing on his co-star, the Knocked Up actor revealed PEOPLEat the second annual Hilarity For Charity House Party in Los Angeles. No big deal, except that his co-star is Zac Efron.Role Call: Who Got Hired In HollywoodMarried to actress Lauren Miller, Rogen, 31, jokes that he can appreciate Efron's body."Zac Efron is incredibly handsome. He's the sexiest [expletive] on the planet!"Rogen and Efron star alongside Rose Byrne, Dave Franco, and Lisa Kudrow in the frat boy movie, Townies."I did a scene with him, and we're both shirtless, and it was a very humbling experience," Rogen laughs. "I marveled at the fact that we're literally the same species."The only way Rogen says he out-mans Efron is when it comes to man hair."I'm hairier than he is, so I win at that," Rogen told PEOPLE.RELATED: Seth Rogen Ties The KnotTownies has been shooting in Los Angeles and is set to release in 2014.