Britney Spears was at the Alicia Keys concert last night with her mom and dad -- the night before her big showdown in court.
Spies tell us security at the Staples Center in Los Angeles had to clear the bathroom out when Britney went to tinkle. She was followed back and forth from the little girls' room by a stampede of little girls -- it looked like a "cattle call," our spy said.
Brit was a good girl though -- she was gone by 10:30 PM. Ya hear that, Your Honor?