Sales data courtesy of Nielsen SoundScan;-

» 'NSYNC, No Strings Attached, 2000: 2,416,000
» 'NSYNC, Celebrity, 2001: 1,880,000
» Eminem, The Marshall Mathers LP, 2000: 1,760,000
» Backstreet Boys, Black & Blue, 2000: 1,591,000
» Eminem, The Eminem Show, 2002: 1,322,000
» Britney Spears, Oops! ... I Did It Again, 2000: 1,319,000 <-------- Genuine sales!
» The Beatles, 1, 2001: 1,259,000
» 50 Cent, The Massacre, 2005: 1,141,000
» Backstreet Boys, Millennium, 1999: 1,134,000 million
» Lady Gaga, Born This Way, 2011: 1,108,000 <------------------------- flaky Lady of 99cents :(