Failed marriage the best mistake of my life: Usher

London: R&B star Usher says he does not regret his failed marriage to Tameka Foster and calls the relationship his `best mistake`.

The 35-year-old `Yeah!` hitmaker endured a highly-publicised and lengthy court battle with the stylist, 43, following their divorce in 2009 but Usher is not bitter about it. The former couple got married in 2007. Usher was awarded primary custody of their two sons, following the legal battle. "Most people probably think I regret it because I ended up getting divorced, but it helped me learn that sometimes I think I know more than I actually do," he said.