Mary Jo Cacciatore (Shaw) (Starring Season 2, Recurring Season 3) : Mary Jo is Sammy's younger sister. She is slightly ditzy and interested in Alex, whom she has known since childhood. She is a cheerleader, though the other girls do not like her due to her laziness and coming to practice drunk. In the second season she had sex with Alex Moran in the drunk tank's elevator. In the third season, she becomes a lesbian and it is implied that she had slept with Debra as payment for "vagazzling" her vagina.