"Check on It" is a song by American R&B singer Beyoncé Knowles, featuring American rapper Slim Thug. It was written by Knowles, Kasseem "Swizz Beatz" Dean, Sean Garrett, Angela Beyincé and Stayve Thomas, and produced by Knowles and Swizz Beatz for the 2006 film The Pink Panther, in which Knowles co-stars. Although not included on its soundtrack album, the song is included on Destiny's Child's greatest hits album #1's and on selected non-U.S. versions of Knowles' second solo studio album, B'Day.