As we reported, Paulk was arrested in August after turning himself in.
His GF told us it started as a verbal disagreement that escalated into a physical altercation ... and Paulk punched her in the face and then kicked her in the stomach.
The GF admits she also threw some punches, but she's the one who ended up in the hospital.
Now Paulk has officially been charged with domestic violence and battery. It's unclear why it took so long to file the case.
If convicted on all counts, he faces up to 4 years in jail.