 However, their new friendship and budding romance is threatened with re-introduction of Michael's sister, Kristina (Lindsey Morgan) and the arrival of her reality show producer, Trey Mitchell (Erik Valdez).Trey seems to annoy Starr a lot, which causes Michael to become a bit more protective of her.However, when Starr and Trey begin to commiserate over their fathers, Starr feels as if Michael is overreacting.