Simon Cowell and Britney Spears appeared on 'Ellen' to promote the 2nd season of 'The X Factor USA.'
On that episode, K-Pop star Psy taught Britney how to dance his famous horse dance.
Unforgettable. UnXpected. Catch the 2-night season premiere of 'The X Factor USA' on September 13 & 14 7PM (and replays at 10PM) only on Studio 23.
Photo via Just Simon Cowell
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