Reminisce with us as we look back at some of Christina Aguilera's best work from her ... and the freedom we can achieve TOGETHER." "Fighter" came as the third single from her fourth studio album ...

"So you'll notice, America, if you know my catalog at all, 'cause I don't, I thought I was singing Christina Aguilera's song 'Fighter,'" Clarkson said with a laugh. "And I was singing mine ...

Teddi Mellencamp, who set her post to Christina Aguilera’s 'Fighter,' made it clear she did not welcome unsolicited advice ...