"Open Wide" is a song by Scottish DJ and producer Calvin Harris from his fourth studio album, Motion (2014). It features American rapper Big Sean. Originally released a promotional single on 27 October 2014, the song officially impacted rhythmic contemporary radio in the United States on 27 January 2015 as the album's fifth single. "Open Wide" is the vocal version of Harris's instrumental track "C.U.B.A", which appears as a B-side to his single "Blame". It peaked at number 23 in the UK, becoming Harris's first single to miss the top ten since 2010.