10/09/2013 07:24 BST | Updated 22/05/2015 06:12 BST

WATCH! Why Britney Spears Left American X Factor

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