"King of Hearts" is a song recorded by American singer Cassie. It was written by Jay Singh, John J. Conte Jr. and Raelene Arreguin. "King of Hearts" is an uptempo electronic dance song that features jungle beats and escalating synths. The song is lyrically centered on the theme of seduction. Music critics praised it for the musical structure, many writing that it differs from most dance-pop music on the radio.

MTV News reported in June 2007 that contrary to rumors, Cassie had not been dropped from Bad Boy Records after releasing two singles from her self-titled debut album. The original first single from Cassie's second studio album was to be "Official Girl", but its lack of commercial success prompted the label to release two other promotional singles: "Must Be Love" and "Let's Get Crazy", both which failed to garner commercial success. After several delays, it was announced in December 2009 that Cassie had signed a new record deal with Interscope Records. In late August 2011, Cassie announced that the album is complete, and that she recorded the last song for the album on August 26, 2011. On September 15, 2011, Cassie announced on 106 & Park that the lead single "King of Hearts" would premiere by the end of October 2011 and the album would be released in early 2012. The song was finally released for digital download on February 14, 2012 and serviced to US Rhythmic radio on March 13, 2012.

"King of Hearts" is a dance-pop and electro-dance song that runs for 3:37 (3 minutes and 37 seconds). The song incorporates elements of several musical genres such as electronic music, Europop, eurodance and contemporary R&B. It features the use of echoing vocal effects Mix/Mastered by Its Hott 2 Productions (Lamis Carneiro) and a fast backbeat while running through a four-on-the-floor rhythm and playing over a bouncy beat. It begins with staccato electro synths and handclaps then follows with "thudding, slightly syncopated" drum programming. The synth arrangements escalate throughout the song. The song's musical structure has been compared to Janet Jackson's "Rock with U" and Kelis' electro-dance album Flesh Tone (2010). The beats have been described as jungle-sounding while Cassie's vocals are described as "cool and restrained". Robbie Daw of Idolator.com found Cassie's vocals to be "paper-thin". The lyrics are centered on seduction, evident in the lyrics: "You are the prince of charm, seduction is your art/ You never play my love, you're just my king of hearts."

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