Nick Gordon Held LegallyResponsible For Whitney Houston's Daughter Death Arrested For Beating Up His Girlfriend.

Nick Gordon -- who was held legally responsible for the death of Whitney Houston's daughter, Bobbi Kristina Brown -- made his first court appearance after being arrested Saturday for allegedly beating up his girlfriend.

TMZ broke the story ... cops cuffed Nick and took him to jail, where he was booked for domestic violence and kidnapping. According to the police report, Nick allegedly beat her so badly Friday she had to go to the hospital.