No doubt Eleanor was looking on from the sidelines as the 20-year-old made a new friend, swimming with dolphins at the Miami Seaquarium.
The huge grin didn't leave his face for a moment as he tried a different aquatic activity, diving with stingrays in a reef at the centre.
Doncaster-born Louis didn't look like he was missing his bandmates Niall Horan, Zayn Malik, Harry Styles and Liam Payne too much.
After spending the majority of this year jetting all over the world, he spent some time kicking back in Florida with Eleanor, who was clearly enjoying herself too .
The Manchester University student posted: "It's been really fun! Weather has been fab!"
The couple headed back to the UK at the weekend however, to attend the wedding of James Corden and Julia Carey.