WATCH! Why Britney Spears Left American X Factor

10/09/2013 11:24 | Updated 22 May 2015

Simon Cowell has seen a lot of US X Factor celebrity judges come and go, the most famous AND most mysterious being Britney Spears. But now, Si has finally revealed why the pop icon left the show. Oh Britney... why britney spears left american x factor

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