Avril Lavigne Celebrates 26th Birthday At Vegas Strip Joint

Avril Lavigne celebrated her 26th birthday with a night of revelry at Sapphire's strip club in Las Vegas Sunday, accompanied by an entourage of six pals, RadarOnline.com has learned exclusively.

Lavigne, our source told us, arrived at about 1:20 am PT, and was perched on the main floor of the club with her pals at first, before migrating over to where the boys were at: the club's male revue.

There, the Canadian vocalist, whose birthday was September 27, enjoyed a few lap dances from some of the club's male entertainers, including one beefcake named A.J., our source said.

A.J. must have enjoyed his job plenty when the gorgeous singer offered to return the favor, and danced for him for about 10 seconds.

Lavigne was clearly in the birthday spirit, as she ventured back to the main floor to receive a few dances from some of the club's female strippers. A few times, the rock star showed off her sexy moves for her friends and some of the club's dancers.

The Complicated singer left the club at about 4:00 am PT, our source said.

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