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Kate Middleton, Catherine, Duchess of Cambridge, Prince William

XPOSUREPHOTOS.COM

What Prince Harry is to Vegas tourism, Will and Kate are to London nightlife?

OK, not quite, but Kate Middleton and Prince William hit the town big last night, reuniting after a day of solo (and, in Wills' case, somber) events when they turned up at the private members club Loulou in the capital's tony Mayfair neighborhood.

Along for the nightcapping ride? Kate's sister, Pippa Middleton, and Princess Eugenie.

The group outing came after Kate returned from a day full of public appearances in Newcastle, a trip she was forced to take solo following the death of Will and Harry's boyhood nanny Olga Powell. Instead of keeping to the royal rota as planned, the duke instead opted to attend the private burial service.

In any case, the duo turned up to the club, reportedly hosting a party for a friend of theirs, around 10 p.m. and attempted to make a low-key exit out the back door of the club just after midnight. (Pippa, on the other hand, closed out the party, not leaving until 2:30 a.m.)

Well, what do you expect from someone who has, literally, written the book on partying?