Cooper surely had a lasting impression in other minds as well. The 30-year-old British actor, who made his official debut as James McAvoy's bff in Starter for 10, has since starred in the Jane Austen miniseries "Sense and Sensibility" as Willoughby and will appear in this month's British caper The Escapist, alongside Brian Cox, Joseph Fiennes (Shakespear in Love), and Damian Lewis ("Life").
But girls all over America will finally take notice of him July 18th when they see him in Mamma Mia! as Amanda Seyfried's (Mean Girls) fiancee. Coming up next, he'll appear in the adaptation of Nick Hornby's An Education, John Krasinski's directorial debut Brief Interviews with Hideous Men, the historical drama The Duchess with Keira Knightley and Ralph Fiennes, and the magical drama David Copperfield with Colin Firth, Simon Pegg, and Rowan Atkinson