Charlize Theron, Sean Penn Make Out, Dirty Dance at Met Gala After Party

Sean Penn and Charlize Theron at the Costume Institute Gala on May 5
Couple Charlize Theron and Sean Penn couldn't keep their hands off each other at a Met Gala after party on May 5 -- get all the details here Kevin Mazur/

It's official, Charlize Theron and Sean Penn really like each other.

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The couple looked sophisticated and sweet as they held hands at the Metropolitan Museum of Art's Costume Institute Gala in New York City Monday, May 5, but they got extra close at an after party following the glamorous gala.

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Theron, 38, who stunned in a strapless Dior Haute Couture white crepe gown, was dancing sexily to Ol' Dirty Bastard's "Got Your Money" with beau, Penn, 53, at an exclusive star-studded after party at the Boom Boom Room at the Standard Hotel, an eyewitness tells Us Weekly.

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The couple enjoyed each other's company on the roof top portion of the nightclub, where they smoked cigarettes and sipped on their drinks. At one point, the source adds, "they play fought with each other" and Theron started "biting on his neck" before they started "rigorously making out."

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The Oscar winners are no strangers to packing on the PDA. The pair, who were first spotted out together in early January when they vacationed in Hawaii, have been caught numerous times making out — everywhere from the beach to a traffic light!

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