Greatest Hits is the second greatest hits album by Danish-Norwegian pop band Aqua. The album was released on June 15, 2009 on Universal. Although it is their second greatest hits album, it is the first one to be released internationally, with Cartoon Heroes: The Best of Aqua (2002) only being released in Japan. The album includes digitally remastered versions of sixteen songs from Aqua's two previous studio albums, Aquarium (1997) and Aquarius (2000), and three new songs: "Back to the 80's", "My Mamma Said", and "Live Fast - Die Young". "Back to the 80's" was released as the album's lead single on May 25, 2009.