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'True Blood' and 'Twilight' stars' sexy showdown on 'Watch What Happens Live'

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Joe Manganiello and Peter Facinelli on "Watch What Happens Live!"

Hope Andy Cohen had a fire extinguisher handy when Joe Manganiello and Peter Facinelli heated up the clubhouse on "Watch What Happens Live" Thursday night!

The smoldering stars of "True Blood" and the "Twilight" film franchise battled each other in several contests, including a sexy face-off. Maganiello, who plays werewolf Alcide on "True Blood," easily took the win with his seductive stare. Facinelli, meanwhile, was chided by Cohen for his terrible Justin Bieber impression.

Then the actors' brute strength was tested in the "Can They Rip It?" game, in which both men tore panties with their teeth, and Manganiello decapitated an adorable teddy bear. (Like peaceable vampire Carlisle Cullen, Facinelli chose to cuddle the stuffed animal instead.)

Both heartthrobs offered candid answers to fan questions, including whether they favored boxers or briefs. Facinelli surprised Cohen by admitting that he goes commando, quipping, "I like to air dry." Manganiello, on the other hand, revealed that he usually wears boxer briefs -- except while filming "True Blood."

"Werewolves are commando," he said, explaining that underwear would complicate the shift from human to beast. "It's method!"

"True Blood" returns June 16, and you can catch Facinelli on "Nurse Jackie," airing now on Showtime.

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