While G20 leaders dined on Jamie Oliver's food across town at Downing Street, Gucci invited Claudia Schiffer, Roland Mouret, Emilia Fox, Isaac Ferry, Jessica de Rothschild, Jamie Cullum, Tom Parker Bowles, David Linley, and Eddie Redmayne to celebrate the "double G-200" (as one editor called it) at a dinner for Frida Giannini at the Saatchi Gallery.

After dinner, guests gathered in a candlelit, pop-up club at the gallery to listen to Richard Ashcroft, The Verve's founder and front man, perform live as waiters passed around trays of desserts, including Gucci red-and-green macaroons.

Daisy de Villeneuve proudly showed off her tiny white leather Gucci clutch - but admitted she was forced to edit the contents before leaving home. "I had to toss out my compact ­ and my glasses ­ because they wouldn't fit. The result is that I can't really see anyone," she said.

Erin O'Connor, who was dressed in a green and blue Gucci halter gown, gushed about Giannini. "It's so nice to have a woman designer at Gucci ­ and someone who doesn't have to rely on the archives to move the fashion forward."

Jasmine Guinness, however, wasn't flying the double-G flag. "I'm rebelling tonight," said Guinness, who was dressed in a Galliano dress and Louis Vuitton coat.