"Mr. Know It All" is a song recorded by American pop recording artist Kelly Clarkson. It was written by Brian Kennedy, Ester Dean, Brett James, and Dante Jones, with the production handled by Kennedy, Dean, and Jones. Clarkson described the song as a "vocally raw record" and stated that she and her producers strove to record her voice as it is heard at live performances, using as little auto-tune processing as possible. It was released by RCA Records as the lead single from her fifth studio album, Stronger on September 5, 2011.

Kelly Clarkson is an American singer, songwriter, television personality, and author. She rose to fame after winning the first season of American Idol in 2002, which earned her a record deal with RCA Records. Her debut single, "A Moment Like This", topped the US Billboard Hot 100, and became the country's best-selling single of 2002. It was included on her debut studio album, Thankful (2003), which entered the Billboard 200 at number one, and also yielded the top-10 single "Miss Independent". Trying to reinvent her image, Clarkson parted ways with Idol management and shifted to pop rock for her second studio album, Breakaway (2004). Supported by four US top-ten singles – the title track, "Since U Been Gone", "Behind These Hazel Eyes", and "Because of You" – Breakaway sold over 12 million copies worldwide and won two Grammy Awards.