Kelly Clarkson 'Invincible' Review: New 'Piece By Piece' Single Penned by Sia Hits Al
 

Sia has penned songs for all of pop's biggest stars, from Rihanna to Britney Spears, so it's about time that she teamed up with Kelly Clarkson, and **w they have. Today (Feb. 23), the original American Idol released the latest track from her new album Piece By Piece, the stunning "Invincible," written by **ne other than the "Chandelier" singer herself.

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