BIG SEAN earned his first #1 album this week with "Dark Sky Paradise" moving 173,000 copies. That's his best sales week by FAR . . . his first album "Finally Famous" sold 87,000 copies and peaked at #3 in 2011. Two other albums debuted in the Top 10 this week: KID ROCK picked up his eighth Top 10 album with "First Kiss" selling 146,000 copies in 2nd place . . . and the CHRIS BROWN and TYGA collaboration "Fan of a Fan" hit #7 with 67,000 copies.

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

1. NEW: "Dark Sky Paradise", Big Sean . . . 173,000 copies

2. NEW: "First Kiss", Kid Rock . . . 146,000 copies

3. The "Fifty Shades of Grey" soundtrack . . . 108,000 copies

4. "If You're Reading This It's Too Late", Drake . . . 99,000 copies

5. "1989", Taylor Swift . . . 78,000 copies

6. "x", Ed Sheeran . . . 73,000 copies

7. NEW: "Fan of a Fan", Chris Brown and Tyga . . . 67,000 copies

8. "In the Lonely Hour", Sam Smith . . . 60,000 copies

9. "Smoke + Mirrors", Imagine Dragons . . . 55,000 copies

10. "V", Maroon 5 . . . 49,000 copies