Which Singers Have Written Songs for Other Famous Stars?

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Did you know that Christina Aguilera wrote Kelly Clarkson's 'Miss Independent?' Crazy, right? This happens more often than you think in Hollywood.

"Secret Songwriters" are artists who've written popular tunes for other singers. This list includes artists like Ke$ha, Bruno Mars, and Jessie J!

Head over to AOL Music to see their gallery of Secret Songwriters! Which ones surprised you the most?
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