Twenty Ten is a two-disc retrospective album by Australian singer and songwriter Guy Sebastian. Disc one contains 18 songs from his previous five albums and two new songs, including the lead single "Who's That Girl" which features American rapper Eve. Disc two has acoustic versions of ten of the songs. The album was released in Australia on 19 November 2010 and reached number four on the ARIA Album Chart, Sebastian's sixth consecutive top ten album. It was certified platinum in its fourth week of release and was the fifth highest selling Australian artist album of 2010. It reached 2× platinum certification in 2014. "Who's That Girl" reached number one on the ARIA Singles Chart and achieved 5× platinum certification, and was Sebastian's fifth of six number one singles in Australia. It won the Highest Selling Single ARIA Award in 2011, and received nominations for Single of the Year and Best Pop Release. Sebastian was also nominated as Most Popular Australian Artist. "Who's That Girl" also reached number one and Platinum certification in New Zealand.