Bon Jovi's penthouse goes on the market and Bonnie wants to be the one to sell it. However, she must go up against Brad to seize this opportunity. Meanwhile, Tucker and Riley vacation at Bon Jovi's empty place; and Danny tests Robyn and Ben's loyalty.

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.