Mr. Know It All

This is the first single by American pop rock singer-songwriter Kelly Clarkson from her fifth studio album, Stronger. The song was debuted on August 30, 2011 during a live webcast hosted by Clarkson on her official website. During her Livestream chat Clarkson discussed why the song was chosen as the album's lead single. "We picked 'Mr. Know It All' because it was unlike any song that, really, I've ever come out with," she said. "Secondly, just because it's very different from a first single for me. Usually we go with an anthem, guitar-driven song. This is very different, and I was really into it… It's just super sassy and it sets up the album nicely. The whole theme is very empowering." The song was sent to radio immediately after the webcast and made available for download on September 5, 2011.

The midtempo break-up tune was written by Brett James (Carrie Underwood), Ester Dean (Beyoncé, Usher, Rihanna) and Brian Kennedy (Chris Brown, Rihanna, Backstreet Boys). Kennedy also produced the track whilst US producer Dante Jones also has a writing credit.

The empowering song finds Kelly warning her guy he might think he's got it all figured out, but "Baby, you don't know a thing about me." She told Entertainment Weekly: "It's everything I am as a woman and a singer. I love telling men off!" Previous Clarkson songs where we heard her shooting men down include "I Do Not Hook Up," "Never Again" and "You Thought Wrong."