Puddle of Mudd singer Wes Scantlin stole his ex-wife's SUV this week, smashed it up, returned it hours later ... and then threatened her -- so says his ex-wife ... who is really hot.
Jessica Scantlin tells TMZ, when she woke up Monday morning and noticed her Honda Pilot had vanished from her home -- she immediately suspected Wes because he'd taken it before.
Jessica says she texted Wes' manager to demand the singer return the vehicle asap -- and 6 hours later he texted back the exact location of her wheels.
She says the manager also texted, "Wes didn't take your car" -- leaving Jessica puzzled about how the manager knew where to find it.
According to Jessica, cops impounded the Pilot to have it tested for prints -- but she's "100% sure it's Wes" because the windows weren't broken ... and she claims it's likely he has a spare key.
And there's this -- Jessica claims, in addition to the SUV having jacked up bumpers and a side view mirror missing ... she also got super creepy texts from Wes after the whole ordeal.
She says one read, "Learn" -- and the other ... "You can't hide. I hope you have a shovel."
Jessica's lawyer Brian Kramer filed a legal request to have Wes held in contempt of court for making the alleged threats -- and for taking the car ... which she was given in the divorce.
Calls to Wes' camp haven't been returned.