Britney Spears, Kevin Federline, and Shar Jackson
In 2004, K-Fed left his pregnant fiancée, Moesha star Shar Jackson, to get with Spears. Soon afterward, Spears gave birth to their sons Sean and Jayden. As for Jackson, she became an entrepreneur, releasing a line of cosmetics called RelationLips. The brand's first product? A lip gloss named "He Cheated."
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