Hollywood's Sexiest Onscreen Couples

Ryan Gosling and Rachel McAdams star as young lovers Allie Hamilton and Noah Calhoun in "The Notebook," the 2004 movie based on Nicholas Sparks' romantic novel. Set in the 1940s in South Carolina, the young couple is forbidden to be together because of their class differences. The actors had such great chemistry that they even dated off-screen. (Amazon.com)