Pippa Middleton’s bum is threatening to steal the limelight from her famous just-married sister, Kate, after jokers posted a cheeky music mash-up video on the internet.

Set to the song Shake Ya Ass by Mystikal, the video highlights Pippa Middleton’s best bottom moments from the Royal Wedding.

In one clip it appears as though a clergyman from the Royal Wedding is nodding in approval of the younger Middleton sister’ derriere.

Pippa sister caused a real stir with her bridesmaid dress on the day of Prince William and Kate Middleton’s wedding, and her rear already has its own Twitter and Facebook accounts.

The Twitter account, @pippasass, which was set up on the day of the wedding, is dedicated to the maid of honour’s bottom bits and has just under 800 followers.

It’s first tweet after the Royal Wedding read: “Wow what a wedding. What did people think of my Bum? #royalwedding #pippsarse.”

A Facebook group praising her assets has already attracted more than 10,000 fans.

The Pippa Middleton Ass Appreciation Society is full of fans extolling the virtues of Prince William’s sister-in-law

[View: http://www.youtube.com/watch?v=ozsXk-j51z4&feature=player_embedded]