Williamson arrives @ H & M

Matthew Williamson's H&M line launches today. So pretty much you should have been in line yesterday. Remember, the merchandise rolls out in a second shipment on May 14 for women so even if you can't get a peacock dress this time around, you'll have another shot in a few weeks. Williamson tells the Times that the line came about thanks to past H&M collaborator Madonna, who, excluding her attempted adoption of Mercy from Malawi, has the power to bring people together. She invited Matthew to one of her first-ever Kabbalah parties in London, where he met Margareta van den Bosch from H&M, who later signed him on to do a line. Now, a lot of fashion people and celebrities act like they're too cool for the mainstream while striving to be famous enough to be part of it (ahem, Lady Gaga), but not Williamson. “I never thought commercial was a dirty word,” he says. “I've never not wanted to dress a celebrity on the grounds that they were too mainstream." See below, Williamson and Longoria, Robert Verdi and Zoe backstage at Williamson show. XO.