Kelly Rowland spent almost $400,000 on a recent night out with friends. She racked up a $372,000 bar bill on guests — including U2 frontman Bono — at Amika’s Weekend Takeover in St. Tropez, France, on Friday. Even when the tab started to get crazy Kelly refused to close it. Spies say Kelly was dancing wildly wearing a Viking hat. To make sure her homies had a good time Kelly 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.