IMAGINE DRAGONS earned their first #1 album this week with "Smoke + Mirrors" selling 195,000 copies. That's their biggest sales week ever . . . their first full-length album "Night Visions" debuted with 83,000 copies in 2012. That was the only new release in the Top 10 this week . . . the next highest debut is "Underdog" from AARON WATSON at #14 with 28,000 copies.

Here are this week's Top 10 albums . . .

1. NEW: "Smoke + Mirrors", Imagine Dragons . . . 195,000 copies

2. "If You're Reading This It's Too Late", Drake . . . 187,000 copies

3. The "Fifty Shades of Grey" soundtrack . . . 165,000 copies

4. "1989", Taylor Swift . . . 93,000 copies

5. "x", Ed Sheeran . . . 81,000 copies

6. "In the Lonely Hour", Sam Smith . . . 72,000 copies

7. "V", Maroon 5 . . . 47,000 copies

8. "Title", Meghan Trainor . . . 44,000 copies

9. "The Pinkprint", Nicki Minaj . . . 41,000 copies

10. Hozier's self-titled album . . . 40,000 copies