The woman who allegedly stabbed ex-NFL star Terrelle Pryor appeared to have SMILED in her mug shot as she was being processed for attempted homicide!
Check out 24-year-old Shalaya Briston -- who was arrested Saturday morning after she allegedly stabbed 30-year-old Pryor during a fight at their Pittsburgh apartment.
Cops say they noticed a bruise on Briston's nose at the time of her arrest -- allegedly caused during the fight with Pryor -- but it's hard to see in the mug shot.
According to court docs, obtained by TMZ Sports, a female witness told police Pryor was the aggressor and had been waiting for Briston after she went clubbing with friends.