With temperatures in New York City well below freezing, Britney Spears left her boys at the hotel where the small family has been staying since the kickoff of New York’s Fashion Week two weeks ago to hit up Club One Little West Twelve in a white busboy jacket and a bikini on Sunday night.

“She didn’t like what she was wearing,” says the spy, “so she asked one of the dancers to trade clothes with her.”

Britney excused herself to the ladies room, took off her tight red number and returned to the dance floor wearing a bikini under a white coat.

Brit’s reps have not returned repeated calls for a statement.