Usually it is some unknown mistress who breaks up a power couple, but in Britney Spears case, she was the celeb who broke up the unknown name’s family. Britney began dating Kevin Federline, a dancer for her ex Justin Timberlake, when he was still with Shar Jackson. Even worse, Shar and Kevin had a child and she was also seven months pregnant. Shar says it “wasn’t like just breaking up a relationship. It was like breaking up a family.” Britney didn’t seem to care and denied that she was seeing Kevin, which obviously was a lie as the two later married, announcing their engagement the same month Shar had Kevin’s second baby. Unfortunately for Spears, the union didn’t last and she lost custody of the two children she had with Kevin. Breaking up families is dirty work.