Now starring on a hit television series, Emma's mom, Angela, unexpectedly returns and wants to see Emma. Ben is reluctant to comply, but when Angela claims she can help get Emma into a good preschool, Ben relents and asks Riley to keep an eye on them. Bonnie is temporarily managing the bar and takes the opportunity to try out some new ideas. And Tucker is living in fear, since he's convinced that Mary Hart is now out to get him. Jess Cagle, editorial director of People and Entertainment Weekly, makes a special appearance as himself.

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.