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.

In August 2015, it was announced that after nine years, Anastacia had reunited with her original label Sony Music Entertainment.

On October 31st, Anastacia performed at Heaven Night Club. The performance included the new song "Army of Me", as well as "Paid My Dues", "I'm Outta Love" and "Left Outside Alone". On November 4th, she went to BBC Breakfast as well as BBC Radio Wales. On November 6th, Anastacia was interviewed at ITV's Lorraine. On November 7th, she appear and perform 2 songs on BBC Radio 2 and on November 8th, she appear on The National Lottery Live.

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