Gwyneth Paltrow’s Birthday Bash: Hugh Grant, Stella McCartney, Jamie Oliver Step Out to Celebrate the Actress’ Big 4-0 (PHOTOS)

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Gwyneth & Cam Step Out
Gwyneth Paltrow and pal Cameron Diaz hit the town.
Gwyneth Bikinis in Italy
Gwyneth Paltrow soaks up the sun.
Gwyneth Paltrow had a little help from her friends ringing in her birthday on Wednesday night.

Celebrity chef Jamie Oliver, fashion designer Stella McCartney and photographer Mario Testino were just a few of the many famous faces spotted at River Cafe in London, England for the star-studded dinner.

Dressed to the nines, many celebs had presents in hand for Paltrow, who turned turned 40 on Sept. 27.

Who else attended the fete?

Hugh Grant and ex-girlfriend Jemima Khan set aside their differences for the night to celebrate their mutual pal’s milestone.

The former couple, who broke things off in February 2007, were in good spirits as the arrived and left together in the same chauffeured car.

Paltrow threw the birthday dinner this week as she and husband Chris Martin were vacationing in Portofino, Italy on the Oscar winner’s actual birthday.

The duo were spotted with their two children, Apple and Moses, aboard a yacht as she was presented with a birthday cake.

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