Britney Spears and Kevin Federline’s two-year marriage may have ended with a Blackberry message, but things only became more “Chaotic” from there on out. This week, we flip through some of Us’ most iconic issues and look back at the roller coaster relationship between K-Fed and the Princess of Pop. (Think: Their three-month engagement, her February 2007 breakdown and today’s ongoing custody battle. 

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