"Blender" magazine wrote that the success of the album consolidated Duff's status as a "tween icon", and estimated that it had earned her US$5,000,000. Moreover, sales of "Metamorphosis" indicated that Duff's popularity with teenagers was rising — 70% of buyers were aged between thirteen and twenty-two, compared to the soundtrack for "The Lizzie McGuire Movie", 70% of the buyers of which were below the age of thirteen. Bob Cavallo attributed the album's success to Duff's amassing of fans of the singers and former Disney "Mouseketeers" Britney Spears and Christina Aguilera. In Canada, the album reached the top spot in its first week of release. It was certified platinum four months after its release for sales of 100,000, and in December 2004 it was certified quadruple platinum for sales exceeding 500,000 copies. In Australia, the album sold well and was certified 2* platinum for sales of 70,000; it was number seventy-four on the ARIA year-end chart. "Metamorphosis" debuted at number twenty-six in France, and peaked at number twenty-two a week later, remaining on the chart for thirty-nine weeks. By late 2005, the album had sold approximately five million copies worldwide. As of July 27, 2014, the album had sold 3,961,000 million copies in the United States and more than 5 million copies worldwide. It became her best selling album to date.