Warren Sapp -- Pleads Guilty In Vegas Girlfriend Attack

Warren Sapp has just pled guilty to domestic violence in Las Vegas -- stemming from an April incident in which he allegedly bit his girlfriend and stomped on her head.

The 42-year-old was initially arrested on 3 counts of domestic violence -- but Sapp struck a plea deal in which prosecutors agreed to drop two of the charges in exchange for a guilty plea.

The Hall of Famer was ordered to complete 6 months of domestic violence counseling and perform 48 hours of community service. He was also banned from contacting the victim and must keep his nose clean for 6 months.

TMZ Sports broke the story ... cops say Sapp attacked his longtime GF Chalyce Moore at the M Resort in Vegas on April 28th.

According to the police report, Sapp allegedly threw a margarita at Moore in their private cabana by the pool and things escalated from there.

Sapp allegedly bit her middle finger during an argument on the car ride back to her condo -- and when they got to her home, he got her on the ground and stomped her head.