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Lady Gaga has a new kind of monster on her mind -- a werewolf! 

A source tells the new issue of Us Weekly (out Friday) that the eccentric singer, 25, is dating Vampire Diaries actor Taylor Kinney, 30, whom she met on the set of her "You and I" video in July. Ironically, Kinney plays Gaga's love interest in the music video, though the song was written for her ex Luc Carl. Gaga dated Carl, 31, an NYC based bartender, author, and semi-pro bowler on-and-off for some years, though she never publicly announced their romance. 

"Something, something about my cool Nebraska guy, yeah something about baby you and I," Gaga sings in her undeniable ode to her ex Carl, a Nebraska native. Filling in as the "cool Nebraska guy" in the video, Kinney goes shirtless and gets hot with Gaga in steamy make-out scenes that clearly won her over.

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"They're hooking up and getting to know each other," says a source close to Gaga. But the pair -- who were spotted leaving NYC's Alvin Ailey dance studio in mid-October -- aren't serious. "Gaga can't be too committed because she works 24/7," says the source. "But she thinks he's supercute!" 

When Us Weekly asked Kinney's Diaries' costar Kat Graham if Kinney is romantic, she said, "Gaga would know more than I would! But he's genuinely sweet -- not an a--hole actor at all!"