Ultimate Collection is a compilation album by American recording artist Anastacia, released on November 6, 2015 by Sony Music. The album includes singles from five of the singer's previous albums Not That Kind (2000), Freak of Nature (2001), Anastacia (2004), It's a Man's World (2012), Resurrection (2014) and songs taken from Anastacia's first greatest hits Pieces of a Dream (2005). Two new songs are also contained in the track list: a cover of Christina Aguilera's "Army of Me" and the lead single, "Take This Chance". Singles from Anastacia's fourth album Heavy Rotation (2008) were excluded from the project.