But while Lovato ruled the Billboard 200, Jackson's 2003 hits set "Number Ones" sold 154,000 copies. However, it was ineligible for the Billboard 200, which generally ranks those albums less than 18 months old. Instead, it topped Billboard's Comprehensive Albums chart, which combines both current and catalog releases.

Elsewhere on the Billboard 200, 2007 "Idol" winner Jordin Sparks' second album "Battlefield" debuted at No. 7 with 48,000 copies. Her 2007 self-titled debut entered and peaked at No. 10 with 119,000. - But what happened to last week's no 1?

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