Robin Thicke had a lot to celebrate after the 2013 MTV Video Music Awards on Sunday night -- but it seems his partying got a little out of hand.

The married dad was recently snapped grabbing the butt of a sexy blonde at NYC nightclub 1OAK, where Thicke hosted an after-party following his VMAs performance with Miley Cyrus.

The photo, which includes a mirror reflection in the background, reveals that the Blurred Lines singer was grabbing the woman's butt as he widely grins for the camera. The pic is believed to have been taken on Sunday night.

Thicke's wife, Paula Patton, was nowhere to be seen in this photo, but she was spotted elsewhere in the club, partying by his side all night.

Earlier in the evening, Thicke took the stage with Cyrus for a raunchy performance of his hit single Blurred Lines.

The We Can't Stop singer stole the show as she stripped down to her underwear for the raunchy performance, which included giant teddy bears and plenty of twerking.

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"Robin thought it would be fun to include Miley, but he didn't realize how much she would overshadow him. This was his big night and big performance," a source told Us Weekly. "I don't think he would have done it knowing what it ended up like."

But another friend claims Thicke still had fun though.

"He had fun and was fine with how it came out. He knew what they were going to do and thought it was fun and awesome. He had a great time," the source said.

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