Bobbi Kristina's Boyfriend Nick Gordon Arrested for Domestic Violence, Allegedly Beat Up New Girlfriend

(TMZ) -- Nick Gordon -- Bobby Kristina Brown's boyfriend who was found legally responsible for her death -- has been arrested for domestic violence and kidnapping his current girlfriend.

Gordon was taken into custody Saturday afternoon in Sanford, Florida. He's facing two charges -- domestic violence battery and kidnapping/false imprisonment of an adult.

Sources close to the girlfriend tell TMZ ... Nick allegedly beat her up Friday night so badly she had to go to the hospital. We're told cops were called but he left before they arrived.

TMZ has obtained photos of some of the girlfriend's alleged injuries.

TMZ broke the story ... Gordon's on the hook for $36 million to Bobbi Kristina's estate, and he's still under criminal investigation for her death too.