A look at the career U.S. album sales, set by set, of the 'X Factor''s two new judges, including when Spears' 'Blackout' passed 1 million sold
Ask Billboard is updated every week. As always, submit your questions about Billboard charts, sales and airplay, as well as general music musings, to firstname.lastname@example.org. Please include your first and last name, as well as your city, state and country, if outside the U.S.
SPEARS, LOVATO'S 'X'-CELLENT SALES
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