Liam is the one who's pulling the plug on his marriage, because TMZ has learned he just filed for divorce from Miley Cyrus.
Liam filed legal docs in L.A. ... citing the standard "irreconcilable differences."
Sources connected to the couple tell TMZ, Liam and Miley had a prenup, keeping their earnings during the marriage separate, so there won't be a fight over money. And, since there are no kids, we're told the divorce will be easy breezy.
The handwriting for weeks ... Miley and Liam August 10, after less than a year of marriage. Our sources tell us Liam is "over the marriage" and just wants to move on.
Miley, meantime, released this video for "Slide Away".