Amal Clooney knew wearing a vintage McQueen gown once was out of the question. Less than a year after she debuted the rare, nine-year-old score, she pulled it out of storage for the King's Trust 50th Anniversary Celebration on May 11. A gold gown battle graced the Royal Albert Hall staircase this afternoon. Lily Collins and Amal Clooney arrived in the same red carpet color trend . Collins's Carolina Herrera rendition , for one, walked on the runway months ago. Meanwhile, Clooney sourced her own closet for McQueen's Fall 2007 gown—one with ties to Cameron Diaz and the Salem witch trials, believe it or not. Amal Clooney attended the King's Trust Celebration in a vintage McQueen gown already in her closet. (Image credit: Getty Images) The human rights lawyer's cap-sleeve, V-neck dress stole the show next to husband George Clooney's navy blue suit. Rows of sequins arranged in a leaf-like configuration gave its column silhouette a 1920s-inspired undertone.…