Pippa, Jemima and Graydon Out in London

Pippa Middleton was out on the town last night, attending a Vanity Fair dinner to launch the Serpentine's new Sackler Gallery, with her new boss Graydon Carter.

Pippa looked pretty darned fabulous as she arrived at the London event in a feather-trimmed shift cocktail dress by British designer Matthew Williamson.

The dinner was co-hosted by Michael Bloomberg, launching his Bloomberg Philanthropies Mayors' Challenge.

London mayor Boris Johnson praised the American attitude to philanthropy, saying, "In America, they believe that if you have made a lot of money you should do something for society," contrasting that with the British approach which consists of: "buying the biggest house they can, with the most colossal grouse moor."

Also in attendance at the dinner was Jemima Khan.