Which Celeb Has A Very Naughty Cake?

Bride-to-be celebrates her upcoming wedding with a very graphic cake

We've seen a lot of naughty party favors for bachelorette parties, but this one takes the cake.

A bride-to-be was celebrating her last days of single life in Vegas this weekend with famous friends and this anatomically correct confection (if you're wondering what's blurred out, let's just say it's not a banana).

Think you know who's got the raunchy cake? Find out after the jump...

It's Katy Perry, who was joined in Sin City by Rihanna for her bachelorette party.

The ladies stayed at Hard Rock and made quite the scene while at the pool. "She had a blow up doll and balloons with erotic images on them," a source tells me. "The girls also had cups with penis straws."

Good to see that hubby-to-be Russell Brand's Friday arrest didn't put the damper on her single soiree!