Say it ain't so ... there's no Muskrat Love left for Captain & Tennille ... they're getting divorced ... and the Captain tells TMZ he didn't see it coming. Toni (Tennille) filed legal docs in Arizona, claiming the marriage was "irretrievably broken." They've been married for 39 years. If you don't…

Two music titans came face-to-face at LAX on Xmas Eve ... Mick Fleetwood (Fleetwood Mac) and Neil Sedaka (ask your parents) ... and it's clear from the video ... MICK IS HUUUUUGE!!!!!!