Jude and Sienna side by side

Jude Law and Sienna Miller chose the Serpentine Gallery Summer Party for their first London public appearance together.

Other guests at the Serpentine included Jade Jagger, Plum Sykes, Trinny and Susannah, Saffron Aldridge, Elle Macpherson, Jasmine Guinness, Erin O'Connor with Jamie Theakston, Dawson's Creek star Katie Holmes, Martin Kemp, Alex James, Simon Le Bon, Neil Tennant and David Furnish.

And Jimmy Choo president Tamara Mellon, 35, surprised friends by arriving with her estranged husband Matthew. Last year 22-yearold Oscar Humphries, claimed he had an affair with Ms Mellon, 35, after her marriage ended.

Serpentine Party committee members Hugh Grant and Jemima Khan were conspicuous by their absence - reportedly because of recent photographs showing them leaving Annabel's together.

Actress Sienna, 22, may have had another reason for keeping so close to Law, 31. Joking about her underwear enhancement, she said: "I've got 'chicken fillets' in my bra. I'm terrified I'm going to pop out at any moment."