They’ve apparently hired designer Atsuko Kudo- who has made clothes for Lady GaGa- to sort them tight (and probably sweaty) outfits for their big day.

A source told The Sun: “Russell and Katy have both got wicked sense of humours and are big fans of Lady Gaga.”

‘They wanted unique outfits and no one dresses like her anywhere in the civilised world. The wedding will certainly be different.”

Earlier this week Katy told a radio station that she wants Rihanna to strip at her hen party, though she didn’t confirm a date.

The singer was asked what part of her mate she most wanted to see and replied: “The whole bit. She’s hot- she’s the coolest chick and we have a lot in common.”

Perry’s new track California Gurls looks set to hit number one this Sunday in the Official UK Singles chart.