Celebrity besties Katy Perry and Rihanna are as close as two mega-famous pop stars can get, so it is no surprise that Rihanna is throwing Katy Perry a bachelorette party. Sounds like fun! Oh, we're sure our invitation was just "accidentally" lost in the mail, right Ri-Ri?

Perry has been telling her fiance, Russell Brand, that her party is going to be "every bit as wild as any party he and his boys will throw," which is kind of a bold statement to make, considering that we are talking about bad boy Russell Brand here.

Perry has a reputation for wacky parties: previous party themes have included paint wars and Willy Wonka. We just hope Rihanna knows better than to invite that party-killer swastika boy to this particular fête.