Whose bare-all butt?Whose lil' booty?It's getting hot in here... so take off all your clothes.

That appeared to be the motto for the Atomic Kitten comeback gig this weekend.

Natasha Hamilton, Jenny Frost and Liz McClarnon were on sizzlingly hot form as they took to the stage at London's G-A-Y club.

The temperature had to have shot through the roof as they unveiled their kinky costumes.

We say costumes - but it was really more a lack of them that had jaws dropping the floors.

The Spice Girls had Roberto Cavalli designing their comeback outfits, but perhaps they would have been better off taking a leaf from the Atomic book of dress skills.

One that takes the erotic road less-travelled rather than the oft-outed glitzy fashion highway.

Though viewer discretion could be advised with the amount of flesh-flashing going on, the Kittens looked nothing short of amazing as they blasted out one helluva comeback gig.

Especially given two of the three ladies are young mums.

But whose pert and shapely booty is shaking its stuff in this pic?

Click into our Atomic Kitten comeback gallery to find out.