Alex Kerkovich – Jane's ditzy younger sister and Dave's ex-fiancée who left him at the altar on the day of their wedding. Alex is the youngest in the group of friends. Despite her reasons for originally calling off the wedding, Alex still feels very guilty about it. She enjoys going on double dates and "girls nights out" with her best friend Penny. She runs her own women's clothing boutique called Xela ("Alex" backwards, pronounced "Shay-la") in downtown Chicago. Though the shop occasionally experiences sudden upswings in popularity, she usually has no actual customers. As the group's token dimwit, she often gets lost or confused during many of the gang's jokes, though she is also known to show occasional signs of intelligence. In season two, she moves in with Penny after accidentally ruining her apartment with smoke damage. She often eats a lot, sometimes surprising the gang, even though she keeps in shape. In season three, she moves into a new apartment with Dave as they enter a new phase of their relationship.