Lady Gaga Boots Adam Lambert From Birthday Party

Lady Gaga celebrated the quarter century mark -- her 25th birthday -- singing with a mariachi band at La Cita Bar, a Mexican restaurant in Los Angeles. But Us magazine reports that Gaga had singer Adam Lambert tossed out of the bash for drunken and unruly behavior!

Lambert, 29, was reportedly a guest of the Scissor Sisters, who are opening for Gaga on her current tour. Perez Hilton spoke to the Morning Dish radio show about the incident, saying that the normally fabulous Lambert "showed up beyond drunk. Super sloppy embarrassingly drunk!" Apparently, in his inebriated state, Lambert reportedly began pumping his fist so intensely that he ended up punching a hole in the ceiling. That's some serious fist pumping!

Hilton also revealed that the former 'American Idol' contestant tried to serenade the birthday girl and a witness reported that Gaga quickly soured of his antics and asked security to have him removed.

Lambert even addressed the incident on his Twitter page after the fact, posting the following tweet: 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."

Drunken antics of Adam Lambert aside, we're sure Gaga had a good time on her birthday, judging from her performance with the mariachi band.