Rob Lowe gives Charlie Sheen an edge when it comes to partying. Lowe tells Vanity Fair that in their younger days, he and Sheen “competed to see who could play harder, then show up for work.” Lowe recently finished his autobiography and shared excerpts with the magazine. He called Sheen “a wonderful mix of nerd and rebel.” The May issue of Vanity Fair will be on newsstands in New York and Los Angeles on Thursday and across the nation April 5.