19 Celebrity Mistresses Who Became the Main Squeeze

When Britney Spears fell for her backup dancer, Kevin Federline, in 2004, he was technically engaged to actress Shar Jackson — and they were also expecting their second child together. Regardless, Kevin and Britney got engaged after three months of dating and tied the knot in September of that year. They went on to have two sons, Sean Preston and Jayden James, but Britney filed for divorce in November 2006, citing irreconcilable differences.