Mariah Carey [ tickets ]'s "E=MC2" sold 463,000 copies during its first week in stores, plenty to give the singer her sixth No. 1 album.

That total also marks the best debut-week performance for any album to date in 2008, topping Jack Johnson [ tickets ]'s "Sleep Through the Static," which sold 375,000 copies its first week out.

Charting at No. 2 this week--down a notch--is Leona Lewis [ tickets ]' "Spirit," which moved 95,000 copies. With sales of 47,000, Miley Cyrus [ tickets ]' "Hannah Montana/Miley Cyrus: The Best of Both Worlds Concert," which was a Wal-Mart exclusive until last week, rockets from No. 31 to No. 3 on The Billboard 200. Billboard bases its flagship album chart on Nielsen/SoundScan data.

Lady Antebellum [ tickets ] enters the chat at No. 4 with its self-titled debut, which sold 43,000 copies. The "NOW 27" hits compilation slips one spot to No. 5 with 39,000 copies sold, according to Billboard.

Rounding out the Top 10 are George Strait [ tickets ]'s "Troubadour," The "Alvin and the Chipmunks" soundtrack, the "Juno" soundtrack, R.E.M. [ tickets ]'s "Accelerate," and Taylor Swift's self-titled album.