TMZ has obtained Christina Aguilera's boyfriend's mug shot -- taken moments after he was arrested for DUI this morning.
As we first reported, Matt Rutler was arrested for DUI around 2:45 AM in West Hollywood.
Law enforcement tells us Matt blew a .09 on a breathalyzer ... just over the legal limit which is .08.
Shortly after Matt got out of jail his ride was also liberated -- he was spotted picking up his Mustang from the impound yard ... which we're told set him back $192.
Christina -- who was riding with Matt -- was popped for public intoxication ... but officials say she won't be prosecuted.