Deshaun Watson made a rare public appearance this week -- celebrating his girlfriend Jilly Anais' birthday with partying, slow dancing and an expensive diamond gift.
The Houston Texans quarterback -- who hasn't played all season -- has remained relatively low-key as he faces multiple sexual misconduct allegations from massage therapists ... but appeared to be in great spirits at the b-day bash.
Watson was by his girl's side throughout the night ... smiling and sharing a romantic dance as a saxophonist played a slow tune.