The singer was out enjoying herself at the Laugh Factory comedy club with six of her friends having fun and downing drinks according to TMZ. Clearly in a good mood the 24 year-old decided to offer the waiter the biggest tip of his life when the bill arrived and despite being just $80 handed over $200 to him.

She asked the waiter what his biggest tip was, to which he replied $100, causing the star to hand over the wad say, according to sources: "Now I'm your biggest tip."

From EntertainmentWise.com

Photo From FanPop.com