"Check on It" is a song performed by American R&B singer Beyoncé, featuring American rapper Slim Thug. It was composed by Knowles, Kasseem "Swizz Beatz" Dean, Sean Garrett, Angela Beyincé and Stayve Thomas. The song was supposed to be featured on the soundtrack album for 2006 film The Pink Panther, in which Knowles co-stars. As it was ultimately not included on its soundtrack album, the song with additional vocals from Slim Thug was featured as a new track on the 2005 Destiny's Child's greatest hits album #1's. It was also later made available as a bonus track on the deluxe edition of Knowles' second studio album, B'Day (2006) in selected European territories in 2007. Columbia Records released the song in the United States on December 13, 2005.
The song's development was motivated by the phrase 'Check on It' which Knowles and her management jokingly used before they decided to turn the idea into a song. "Check on It" derives genres from R&B as well as hip hop and lyrically, the song takes place in a club, where Knowles is letting the male patrons know that they are welcome to come and look at her sexually attractive body when she is dancing. The track consists of two verse-raps by Slim Thug. The song was generally well received by music critics who universally complimented the pleasant vocals of Knowles and assertiveness with which she delivers her lyrics.
"Check on It" was not originally lined up for an official release as a single from the album #1's. However, it received heavy rotation from US radio stations, following the release of the first single, "Stand Up for Love" (2005), which performed poorly on the charts in the US. Eventually, "Check on It" debuted on the US Billboard Hot 100 in November 2005, that is, before its official release. In February 2006, the single reached the summit of the Billboard Hot 100, becoming Knowles' third number-one single in the US as a solo artist. It remained at number-one for on the Hot 100 chart for five consecutive weeks, becoming one of the two longest-running number-one single in 2006, the other being Daniel Powter's "Bad Day" (2005). Additionally, the song peaked at number one on the New Zealand Singles Chart and also performed well in mainland Europe, reaching the top ten in the Netherlands and Norway, amongst others.
The music video for the song was directed by Hype Williams, and was premiered on December 16, 2005. It was shot in pink to brand the relationship with The Pink Panther. "Check on It" won the Best R&B Video at the 2006 MTV Video Music Awards, and was also nominated in the award category for Video of the Year at the 2006 BET Awards. Although Knowles did not perform the song in any televised appearances, the song was a part of her set list on The Beyoncé Experience at the Staples Center in Los Angeles and I Am... Tour.