Shay Mitchell will soon be slow-motion running on the sand, as she is the latest actor to join the cast of Fox’s “ Baywatch ” reboot. The “Pretty Little Liars” star will play Trina, a former lawyer who walked away from a white-shoe law firm to become a full-time lifeguard. Per the character description, “Trina is the sharpest mind on Baywatch. Passionate and dedicated, she tends to follow her heart… even if she often uses her considerable intelligence to second guess herself.” 'Bridgerton'