"Sexy and I Know It" is a song by American duo LMFAO from their second studio album, Sorry for Party Rocking. It was released as the third single from the album on 16 September 2011. The song was written by Stefan Kendal Gordy, GoonRock, Erin Beck, George M. Robertson and Kenneth Oliver, and it was produced by Party Rock. It went to number one on the Billboard Hot 100 on January 7, 2012 and remained there for two weeks. The song became LMFAO's second number one hit (after "Party Rock Anthem") on the Billboard Hot 100 in the United States, making them the first duo to have two successive number-one singles since OutKast's "Hey Ya!" (2003) and "The Way You Move" (2004).The song also reached number one in Australia, Canada and New Zealand, and charted within the top 10 in nearly every country in which it charted. The song was featured in the season 5, episode 12 of Gossip Girl.and in the Glee episode, "The Spanish Teacher".