Lady GaGa, Adam Lambert

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Adam Lambert admits he partied too hard at Lady Gaga's birthday bash.

After attending her L.A. concert Monday, Adam reportedly showed up to her soiree as a guest of the Scissor Sisters, who opened for Gaga.

But the birthday girl was none too pleased after he punched a hole in the ceiling...

Last night, Adam took to his Twitter to semi-apologize for his antics, which included screaming, jumping on tables and smearing birthday cake in Gaga's face, according to Us Weekly.

UsWeekly reports that Gaga got her security team to bounce him from the party, but a source tells E! News that's untrue.

Blogger Perez Hilton also witnessed the American Idol alum's out of control behavior. "Adam showed up beyond drunk," Perez told 97.1's Morning Dish radio show. "Super sloppy embarrassingly drunk!"

"Sloppy" is the same word Adam used to describe his state of mind that night, too.

"Was trying for celebratory gesture 4 gaga's B- piñata style...instead my fist is all bruised and la cita has a hole in the ceiling. #sloppy," he tweeted.

If we were him, our ego would be pretty bruised, too.

The Born This Way singer hasn't tweeted yet about the incident and reps for both singers couldn't be reached for comment.

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