The One Directioner swapped Harry, Liam, Zayn and Niall for some aquatic pals as he enjoyed a holiday in Miami.
Louis was with his girlfriend of one year Eleanor Calder, as he a took a dip with some dolphins and splashed about with some stingrays.
He and Eleanor have been on a string of holidays this year, having already visited Nice and New York together. Their latest break came after One Direction's triumph at the MTV Video Music Awards earlier this month.
Meanwhile, Louis has caused mayhem after releasing tickets to see him play in a charity football match.
Louis recently bought his own local pub team and is set to play Doncaster Rovers next month.
Demand for tickets have apparently been "mad", with fans dying to catch a glimpse of their hero in his footie shorts.
Steve Uttley, Rovers' media manager, said: “The phones never stopped all morning. It just went mad and was really busy.
“At one stage we had 4,000 people in the phone booking queue.”
> IN PICS: LOUIS BEFORE HE WAS FAMOUS