|One Direction at the "MIB3" premiere|
It turned out the nude man was not a fan trying to get close to Louis but was simply trying to find a toilet.
A source told The Sun newspaper: "Louis heard a noise because he wasn't sleeping well with jet lag. At first he thought it would be another fan who had sneaked past minders.
"When he saw it was a small naked man he called security, who sorted it out. This bloke wasn't even a hotel guest, but a drunk who was looking for a toilet."
The boy band - made up of Louis, Zayn Malik, Harry Styles, Niall Horan and Liam Payne - recently had to increase their security after two members of the band were mobbed in New York.
Liam had his t-shirt ripped and Niall had his hair pulled when they went to leave their hotel in the city, and now each member of the band has their own personal security man.
A source said: "They are going to have to be more careful in the future and have at least a security guard each with them.
"It's a shame for the boys because they appreciate their freedom."