"who's that chick", which he labelled as being stupid. Becky Bain for Idolator praised the song for not sounding as "generic" as Katy Perry's releases "California Gurls" and "Teenage Dream" (2010). Tom Byron for The Vine compared the song to Australian singer Guy Sebastian's "Who's That Girl" (2010) and Madonna's "Who's That Girl" (1987). Chart performance "Who's That Chick?" achieved moderate chart success around the world. In Australia, it debuted at number 36 on 5 December 2010, and peaked at number seven in its eighth week on the singles chart. It was certified double platinum by the Australian Recording Industry Association (ARIA), denoting shipments of 140,000 units. In New Zealand, the song debuted at 28 on 28 November 2010, and peaked at number eight for two consecutive weeks 10 January 2011. The song was certified platinum by the Recording Industry Association of New Zealand (RIANZ), denoting sales of 15,000 copies. In Europe, "Who's That Chick?" debuted at number nine on the singles chart in the Wallonia region of Belgium on 12 December 2010 and peaked at number on the singles chart in its seventh week on 15 January 2011. It was certified gold by the Belgian Entertainment Association (BEA), denoting sales of 10,000 copies. The song peaked at number four in Austria on 12 December 2010. It debuted at number 11 in Finland on 29 November 2010, and peaked at number five two weeks later. In France, "Who's That Chick?" debuted at number six on 29 November 2010, where it remained in its second week. The song peaked at number five in its third week, where it remained for a further two weeks. The song debuted and peaked at number five in Norway on 29 November 2010, and remained in the top ten for three more weeks. In Spain, the song debuted at number 11 on 28 November 2010, and peaked at number five in its tenth week after fluctuating within in the top twenty. The song was certified by the Productores de Música de España (PROMUSICAE), denoting sales of 20,000 copies. The track was certified gold by the Bundesverband Musikindustrie (BVMI), denoting shipments of 150,000 copies. The song was less successful in Sweden and The Netherlands, where it peaked at numbers 14 and 16, respectively. In the United Kingdom, "Who's That Chick?" debuted at number nine on the UK Singles Chart on 11 December 2010. In the same chart