Kelly Clarkson gets help from the Amazing Sia on her new album .

Before catapulting to massive mainstream success with "Chandelier," Sia made a name for herself penning songs for other divas, including Beyoncé, Britney Spears and Rihanna. 

The recent Grammy nominee contributed two tunes, "Invincible" and "Let Your Tears Fall," to Piece by Piece. 

Says Clarkson of the former: "I love her! Music is supposed to lift you up and make you feel welcome, like you're not alone. So I guess I do gravitate towards that – the idea of overcoming something."