“Birthday” is the fourth single released by American singer Katy Perry for her fourth studio album, Prism.
Critics, as well as Perry herself, have compared the track to Prince and Mariah Carey on her debut album.
Through double entendres in the lyrics of “Birthday”, Perry makes sexual references while celebrating a partner’s birthday. The song was sent by Capitol to mainstream and rhythmic radios on April 21, 2014 as the fourth single from Prism.
Upon release, “Birthday” received generally positive reviews from music critics, who praised the song’s melody but occasionally criticized the sexual references. Following the release of Prism, “Birthday” entered the single charts of South Korea and France. After being released as an official single, it reached the top 50 on Australia, Canada and Netherlands’ single charts, while peaking at number 37 on the US Billboard Hot 100.
A music video for the track was released on April 24, 2014. Primarily recorded with hidden cameras, it features Perry disguised as five different characters in birthday parties and other celebrations. It received mixed reviews from critics.