"Who's That Girl" is an up-tempo electro R&B song performed by Australian singer-songwriter Guy Sebastian which features American rapper Eve. It was written by Sebastian, with Eve writing and performing the rap. Sebastian co-produced the song with Andre Harris. Released as a digital download on 5 November 2010, it was the only single released in Australia from Sebastian's retrospective album Twenty Ten. "Who's That Girl" reached number one on the ARIA Singles Chart, Sebastian's fifth of six number one singles in Australia and Eve's first. It was also Sebastian's seventh of 12 top ten singles on the Australian charts. It reached 5× platinum certification in 2014. "Who's That Girl" was shortlisted for the 2011 APRA Song of the Year and won the APRA Urban Work of the Year. Sebastian received ARIA Award nominations for Single of the Year and Best Pop Release and won the Highest Selling Single ARIA. He was also nominated as "Most Popular Australian Artist". "Who's That Girl" also reached number one and platinum certification in New Zealand, Sebastian's second number one single there. Background "Who's That Girl" was recorded in Australia and London. Sebastian stated in an interview that he recorded his own vocals at his home, "The funny thing about that single is that I did all the vocals in my dining room in Australia and we sent it across to Andre Harris who did his thing on the track by adding his magic production touch." He also spoke about writing the song, "It's actually a completely original song that I kept going back to rewrite over and over again because, at first, the musician in me thought it was too simple in its structure... but then I realised that sometimes simplicity is the best way forward to keep things fun and hook-y." Sebastian told The New Zealand Herald that it was based on songs he was hearing on the radio from the likes of David Guetta, and The Black Eyed Peas. "I'm not reinventing the wheel, not at all. I had that melody, and I could have gone so many ways with it. I could have produced an old-school soul album, but I went towards what you hear on the radio. I'm not going to lie, I listen to what's popular at the moment, and it's what I'm really liking as well." Sebastian considered getting Eve on the song as quite a coup. He