Bridget Jones, now in her 40s and newly single, decides to focus on her career as a top news producer. While attending a music festival, she has a chance encounter with a charming American named Jack and ends up spending the night with him. Shortly after, she reconnects with her ex, Mark Darcy, at a christening, and they also share an intimate moment. Bridget soon discovers she's pregnant, but the twist is she doesn't know who the father is—Jack or Mark.

As Bridget navigates her unexpected pregnancy, she grapples with the emotional and logistical complexities it brings. Jack and Mark both express a desire to be part of Bridget's life and the baby's upbringing, each bringing different strengths to the table. Amid humorous and heartwarming moments, Bridget faces numerous challenges while trying to maintain her professional commitments and personal sanity. Her journey is marked by her determination to embrace motherhood and the supportive friends and family who rally around her as she embarks on this new chapter of her life.