Sisters Pippa and Kate Middleton go clubbing with Prince William in London

Kate Middleton is back on the public scene in full force now that the buzz generated by her nude photos has died down a bit.

After making several official appearances in Newcastle while husband Prince William attended his nanny's funeral, the Duchess regrouped in London on a mission to let her hair down.

Kate and sister Pippa Middleton joined back up with Will to host a party for a friend at Loulou, a private club in Mayfair, arriving around 10 p.m. E! Online reports Will and Kate tried to sneak out the back exit after midnight, while Pippa -- unafraid of turning into a pumpkin -- partied until 2:30 a.m.

Will's brother, and now famous party boy, Prince Harry is still in Afghanistan.