Showing Baby Business by Brenda Novak

Macy McKinney will do anything for five-year-old Haley. Businessman Thad Winters, a widower, wants a child without the complications of a relationship. He's willing to pay for that.

He interviews applicants--and hires Macy to have his baby. Once Macy's pregnant, they decide that a temporary marriage will simplify the situation--but it does exactly the opposite!