Her first novel, Cause Celeb (1994), satirized the connection between celebrities and humanitarian crises, drawing on her experience making documentaries in Africa. However, it was Bridget Jones's Diary (1996) that brought her worldwide fame. Originally a weekly column in The Independent, the novel humorously chronicled the life of a thirty-something single woman in London struggling with love, weight, career, and self-improvement. The book sold over fifteen million copies and helped popularize the "chick lit" genre. Its sequel, Bridget Jones: The Edge of Reason (1999), was equally successful, and both were adapted into hit films starring Renée Zellweger, Colin Firth, and Hugh Grant.
Fielding later wrote Olivia Joules and the Overactive Imagination (2003) and revisited her beloved heroine in Bridget Jones: Mad About the Boy (2013), exploring widowhood and life in middle age. Her writing is celebrated for its sharp wit, warmth, and keen social observation.