Photos showing a naked Prince Harry cavorting with a woman in Las Vegas are genuine, Clarence House has confirmed to British media.

Celebrity news website TMZ published two photos of a nude redheaded man partying in a hotel room. 

Prince Harry's spokesman at Clarence House confirmed to MailOnline that the pictures were genuine, but said they would not be commenting on them. Clarence House also confirmed the authenticity of photos to ITV News.

"Prince Harry was letting off steam in California over the weekend before he returns to the next phase of his military duties," a Royal source told ITV.

In one photo a topless woman is standing behind him and in another he is bear-hugging a woman who also looks to be completely naked.

According to TMZ, the prince, along with a large entourage, went down to the hotel bar and met a group of women before inviting them up to his VIP suite. Once in the room, the group began playing a game of strip billiards.

Someone began snapping pictures and caught Prince Harry fully nude.

The party didn't end there. Prince Harry also leaped into a swimming pool at 3am on Monday night during his three-day trip to Vegas.

He was still wearing his jeans and challenged Olympic gold-medallist Ryan Lochte to a race, according to thedailybeast.com.

"It was really fun swimming against Prince Harry. He's a great guy, and it was an huge honour to meet him." Lochte told E News.

"I was surprised that he challenged me actually. I didn't know if he had any skills in the pool, but I definitely wasn't going to take it easy on him."

Lochte said Prince Harry was a "great competitor," but it was Team USA that won in the end.

The prince lost, despite having a head start, in front of 5000 other guests.

It wasn't the first time Prince Harry jumped fully clothed into a swimming pool however. He did it before on a holiday in Croatia last year.

The prince was often caught partying drunk during his teenage years, but it appeared he had put most of it behind him.

He has been taking more responsibility as a royal member, including being the official royal representative of the Monarch at the Olympics' closing ceremony.

- © Fairfax NZ News