Sarah Brown..US first lady Michelle Obama, standing behind her, is joined by the wives and guests of G20 delegates attending a dinner at London's

Sarah Brown, wearing a brown dress, seated center with US first lady Michelle Obama, standing behind her, is joined by the wives and guests of G20 delegates attending a dinner at London's Downing Street, Wednesday, April 1, 2009. Celebrity chef Jamie Oliver will cook the meal for G20 leaders at Downing Street which will feature seasonal, local produce as well as slow-roasted Welsh lamb for the main course for Wednesday's dinner