Kelly Rowland Racks up $400,000 Bar Bill

Kelly Rowland spent almost $400,000 on a recent night out with friends.

The 'Work' hitmaker racked up a $372,000 bar bill on guests -- including U2 frontman Bono -- at Amika's Weekend Takeover in St. Tropez, France, on Friday.

A source says, "Kelly was the ultimate host and even when the bar bill began to spiral out of control, she refused to close the tab. She had 30 very thirsty pals, so it was always going to be a pretty big night.

"At one point, Kelly started dancing wildly and put on a silly Viking hat, much to the hilarity of everyone.

"Bono arrived quite late and Kelly told him to order whatever he liked. A good night was had by all."

Kelly, 27, treated her guests to 50 magnums of $6,000 vintage Dom Perignon, 24 bottles of $1,000 Patron tequila and 10 bottles of $4,000 Louis XIII cognac.