What movie, starring Renée Zellweger, was based on a book by the director's close friend? 
Sharon Maguire: Sharon Maguire (born 17 August 1961) is a film director who came to prominence with "Bridget Jones's Diary". Sharon Maguire:  The film was based on the book by her close friend Helen Fielding, and one of the main characters – "Shazza" – is allegedly based on Maguire. Bridget Jones's Diary (film): Bridget Jones's Diary is a 2001 British-American-French romantic comedy film directed by Sharon Maguire and written by Richard Curtis, Andrew Davies, and Helen Fielding. Bridget Jones's Diary (film):  The adaptation stars Renée Zellweger as Bridget, Hugh Grant as the caddish Daniel Cleaver, and Colin Firth as Bridget's "true love", Mark Darcy.
Bridget Jones's Diary