The Other Woman (2009)

Aspiring Lawyer Emilia Greenleaf (Natalie Portman) thought she knew what she wanted when she went after the sexy, married Senior Partner, Jack Woolf (Scott Cohen) . However, she didn't count on getting pregnant and married, and she certainly didn't plan on having to forge a relationship with her highly strung 5 year old stepson, William.

In Manhattan, twenty-two year-old Harvard lawyer Emilia Greenleaf has a crush on her boss, Jack Woolf, and they have an affair. Jack's marriage is a sham but his son, William, is his pride and joy. Emilia soon discovers she's pregnant, and Jack divorces from his wife, Carolyne, in order to marry her. His son is poisoned against the partnership by his mother, and he is also resented by his stepmother. Emilia, who has issues with her womanizer father, delivers Isabel but three days later, the baby dies. Her marriage begins to suffer and unexpectedly William steps in to help find out the truth about Isabel's death.