Even though Ben and Riley are officially back together, Ben can't shake the feeling that there's something going on between Riley and Danny. Tucker is shocked when Riley confesses that she knows how Danny feels about her. In a somewhat flawed plan, Ben decides to test Riley's feelings for his brother, so he writes Danny a love note and signs her name. When she realizes what he's done, a furious Riley tracks Ben down in the Rangers' locker room. Will she be able to convince Ben that he's really the one she wants, or is he right to wonder if there's something more between his girlfriend and her best friend? Meanwhile, as Danny gets ready to join Georgie in Paris, Bonnie realizes her cash cow is leaving and starts selling his Rangers memorabilia.

Baby Daddy follows Ben, a young man in his early 20s living the life of a bachelor in New York City with his buddy, Tucker, and his brother, Danny. Their lives are turned upside down when they come home one day to find a baby girl left on the doorstep by an ex-girlfriend of Ben's. After much deliberation, Ben decides to raise the baby with the help of his friends and his protective and sometimes over-bearing mother, Bonnie, and his close female friend, Riley.