Ben poses as Bonnie's husband, Brad, when her friends from work don't believe that she has an attractive, younger lover. When Danny begins dating a beautiful actress as a publicity stunt, Riley, who believes the relationship is real, decides to go back out with Ross to make Danny jealous. Tucker tries to further his entertainment reporting career by getting the real scoop on Danny and his new girlfriend.

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.