This is a huge amount compared to most number one singles. It's the first record to sell more than 200,000 copies in the States since 1999.
American Idol, the US version of Pop Idol, was a phenomenal success stateside.
Pop Idol's Mr Nasty, Simon Cowell, was one of the judges and he's made a name for himself in America too.
Kelly's now got an album due out in November.
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