Britney SpearsBritney Spears must be desperate to get back to performing: she reportedly jumped up on stage at a Los Angeles burlesque club on Sunday night to gyrate for the crowd between professional striptease acts.

According to the New York Daily News, Britney was at the club, 40 Deuce, with friends when the moment grabbed her and she jumped onto the stage. She danced around for a little while with a cigarette in one hand and unzipped her top with the other hand so the audience could see her bra. She was having so much fun that the club’s manager reportedly had to step in twice to physically remove her from the stage.

Perhaps though, the exercise would have been good for her: her new partying lifestyle is reportedly taking its toll on her figure, just months after she lost weight following the birth of second son, Jayden in September.

Britney is thought to have gained around over two stone (around 28 pounds) while pregnant with first son Sean and then Jayden but lost the vast majority of the weight within less than six weeks of giving birth the second time around (albeit possibly helped by a tummy tuck).

An inside source told the Mirror: “Britney has done an amazing job shedding her baby weight since having Jayden in September. She stopped the junk food, and her favourite full-fat drinks after splitting from Fed.”

“But in the last few weeks she’s slipping back into her old ways.”

“And after boozy nights out with Paris, they head straight to a burger joint, then back to Paris’ house for more drinks. It’s taking its toll on her.”