He is the background dancer who struck absolute gold when he caught the attentions of Britney Spears. Already engaged to the mother of his first child, Shar Jackson (who at the time was heavily pregnant with Federline's second child) he quickly set out to steal the singer's heart/fortune by knocking her up then marching her down the aisle. He fathers two of Spears children, Sean Preston and Jayden James. She reportedly dumped the dancer in a text after allegations of his infidelity hit the papers. He also tried his hand at rapping and released an album. Ever heard of it? Nope, us neither.