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The Cheaters: Meg Ryan and Russell Crowe

The Details: Meg Ryan and Dennis Quaid vied for the title of America's Sweetheart Couple in the '90s, but trouble was on the horizon. Enter Russell Crowe. The dashing Aussie swept Meg off her feet on the set of Proof of Life, and Meg and Dennis called it quits. At the time, Meg got a lot of flack the the affair -- how could she abandon poor Dennis? -- but she finally shot back in 2008, claiming that Dennis had done his share of cheating. Too late -- Dennis won that particular PR war, and Meg and Ryan only lasted a few months.