Julia Roberts plays Isabel Kelly, the young and free-spirited girlfriend of Luke Harrison who must learn to navigate the challenges of becoming a stepmother.
Susan Sarandon portrays Jackie Harrison, the devoted mother of Ben and Anna who finds herself grappling with the reality of sharing her children with her ex-husband's new partner.
Ed Harris takes on the role of Luke Harrison, a successful businessman and father who must balance his relationship with Isabel while also being there for his children, Ben and Anna.
Jena Malone plays Anna Harrison, the teenage daughter of Luke and Jackie who struggles to come to terms with her parents' separation and her father's new relationship.
Liam Aiken portrays Ben Harrison, the young son of Luke and Jackie who forms a close bond with Isabel despite the initial challenges of accepting her as a parental figure.
Lynn Whitfield is Dr. P. Sweikert, a professional in the family's life who provides support and guidance during the difficult times they face.
Darrell Larson takes on the role of Duncan Samuels, a minor character in the film who contributes to the story's development.
Mary Louise Wilson portrays Mrs. Franklin, a character with a brief appearance in the movie.
Andre B. Blake is Cooper, a character who plays a small role in the story.
Herbert Russell appears as the Photo Assistant, a minor character in Stepmom.
Jack Eagle is the Craft Service Man, adding to the behind-the-scenes elements of the film.
Lu Sierra appears as the Photo Shoot Model, playing a small part in the movie.
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