Prince HarryPrince HarryPrince William and Harry like to party - fact.

But this night may have been a bit too hard core, even for them.

The bros went out for a night on the tiles in London town, and got introduced to the Wau Wau sisters.

Who are they? We hear you cry.

Well they're burlesque dancers who did a little performance for the boys.

The Wau Wau sisters dangled from trapezes and writhed around while wearing skimpy hot pants and crop tops.

And then things got even hotter as a French dancer called La Galu went through a steamy routine at the packed club.

One spectator told the Daily Mirror: "When the Wau Wau girls came out William and Harry looked stunned.

Prince William and Kate MiddletonPrince William and Kate Middleton"They're very athletic and were dangling right in front of them."

Another added: "It was hardly tea with the Queen. Both lads looked transfixed by all the sexy acrobats and sat there cheering and laughing."

"Normally La Galu shows her boobs and most of the rest of herself. But she was more modest for the princes."

After the show, Wills and Harry partied on at the London nightclub Boujis where Wills met girlf Kate Middleton.

We wonder how quick Will was to fill her in on the earlier part of his evening?