Piece By Piece sold 97,000 copies (83,000 of those were traditional album sales), narrowly beating out the Fifty Shades of Grey soundtrack which sold 96,000 copies this week.
Clarkson previously topped the Billboard 200 with her 2003 debut, Thankful, and then again with 2009's All I Ever Wanted.
Meanwhile, over on the Hot 100, Mark Ronson and Bruno Mars' Uptown Funk has just notched a staggering tenth week at No. 1. It's now the 29th song in Billboard history to spend at least ten weeks at the top.
I guess this makes Uptown Funk the Blurred Lines of 2015? Except without all the plagiarism and nudity and all of that...