heavy synth beat. During the chorus, Rihanna sings "She's been a crazy dita/ Disco diva, and you wonder/ Who's that chick? Who's that chick?/ Too cold for you to keep her/ Too hot for you to leave her/ Who's that chick? Who's that chick?", which incorporates heavy usage of Auto-Tune. Robert Copsey for Digital Spy described Rihanna's vocal performance as "nonchalant vocals feeling colder than an ice pop on a snowy day." Release "Who's That Chick?" was made available to download digitally in Australia, certain territories in Europe and the United States on 22 November 2010. In Germany, it was also released as a CD single on 26 November 2010; it included the original version of "Who's That Chick?" as well as an FMIF! remix of the song. In the United Kingdom, the song was released as a CD single on 28 November 2010. In the US, an extended play (EP) was released on 7 January 2011; it included a radio edit of the song, a remix by Adam F., as well as extended and instrumental versions. In February 2011, Virgin/EMI label executives asked European radio stations to remove "Who's That Chick?" from their playlists because Rihanna had multiple songs on the chart. Due to how Rihanna's Loud was released at the same time as Guetta's album, label executives asked radio stations to favor her work instead. In an interview for the Daily Star, Guetta addressed the song being removed from European radio stations playlists, saying "My record label sent letters to all the radio stations asking them to stop playing Who's That Chick as Rihanna's album was out at the same time. It was strange because normally record labels ask radio stations to play your music." Critical reception Robert Copsey of Digital Spy described the collaboration as one of the more confusing releases of 2010, due to how the song was connected to three different projects, including the Dorito's campaign and both Guetta's and Rihanna's albums. Copsey praised Guetta's ability to provide a "proper dance-pop stonker" and was complimentary of its composition. He concluded his reviewing with "It's a good job, then, that bopping along to this – and warming yourself up in the process – is pretty much impossible to resist." A reviewer for Popjustice was divided on the song's lyrics; though he found the line "beating like a disco drum" fantastic, he remained unconvinced by the line,