Bonnie's special day is right around the corner, and she couldn't be happier, at least until she learns the wedding planner has quit and all of their plans literally went up in smoke. Just as Bonnie puts Tucker in charge of everything, her best friend, Charlotte, arrives for the big event and is ready to lend a helping hand. But when Charlotte takes over and everything starts going wrong, Tucker does some digging and discovers that her intentions aren't totally pure; turns out she has revenge on her mind for a long-ago grievance. Danny's recent confession that he's been in love with Riley his entire life has put Ben in an uncomfortable spot, but he knows that he can't stand in the way of his brother's happiness. In an effort to get through to Danny and Riley, Ben's wedding speech has a surprising effect on all parties involved and prompts Danny to take charge and make the ultimate romantic gesture.

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.