Question: What movie, starring Renée Zellweger, was based on a book by the director's close friend? 

Context paragraphs:
Sharon Maguire: Sharon Maguire (born 17 August 1961) is a film director who came to prominence with "Bridget Jones's Diary".  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.

Nurse Betty: Nurse Betty is a 2000 American black comedy film directed by Neil LaBute starring Renée Zellweger as a Kansas waitress who suffers a nervous breakdown after witnessing her husband's murder, and starts obsessively pursuing her favorite soap actor (Greg Kinnear), while in a fugue state.  Morgan Freeman and Chris Rock play the hitmen who killed her husband and subsequently pursue her to Los Angeles.

Shake, Rattle and Rock! (1994 film): Shake, Rattle and Rock!  is a 1994 television film starring Renée Zellweger, Howie Mandel and members of the Grammy-nominated R&B band For Real.  The film was produced by Lou Arkoff (son of B movie producer Samuel Z. Arkoff) as part of the "Rebel Highway" series of television films made in a short-lived revival of American International Pictures that aired on the Showtime television network.

Chicago: Music from the Miramax Motion Picture: Chicago: Music From the Miramax Motion Picture is a soundtrack album featuring all of the original songs of the 2002 Best Picture Academy Award-winning musical film "Chicago" starring Renée Zellweger, Catherine Zeta-Jones, Queen Latifah, Richard Gere, John C. Reilly, Mýa Harrison and Christine Baranski.

A Price Above Rubies: A Price Above Rubies is a 1998 British-American drama film written and directed by Boaz Yakin and starring Renée Zellweger.  The story centers on a young woman who finds it difficult to conform to the restrictions imposed on her by her community.  Reviews of the movie were mixed, though generally positive to Zellweger's performance.

New in Town: New in Town is a 2009 American-Canadian romantic comedy film, directed by Jonas Elmer, starring Renée Zellweger, Harry Connick Jr and Siobhan Fallon Hogan.  It was filmed in Winnipeg and Selkirk, Manitoba, Canada, and in Los Angeles and South Beach, Miami, Florida.

Case 39: Case 39 is a 2009 American supernatural psychological horror film directed by Christian Alvart, and starring Renée Zellweger, Jodelle Ferland, Bradley Cooper and Ian McShane.

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.  It is based on Fielding's novel of the same name, which is a reinterpretation of Jane Austen's "Pride and Prejudice".  The adaptation stars Renée Zellweger as Bridget, Hugh Grant as the caddish Daniel Cleaver, and Colin Firth as Bridget's "true love", Mark Darcy.  Production began in May 2000 and ended in August 2000, and took place largely on location in London and the Home Counties.  The film premiered on 4 April 2001 in the UK and was released to theatres on 13 April 2001 simultaneously in the UK and in the US.

Texas Chainsaw Massacre: The Next Generation: Texas Chainsaw Massacre: The Next Generation (originally The Return of the Texas Chainsaw Massacre) is a 1994 American independent slasher film written and directed by Kim Henkel, and starring Renée Zellweger and Matthew McConaughey.  The plot follows four teenagers who encounter Leatherface and his maniacal family in backwoods Texas on the night of their prom.  It is the fourth installment in the "Texas Chainsaw Massacre" series, and also features uncredited cameo appearances from Marilyn Burns, Paul A. Partain, and John Dugan, all stars of the original film.

My Own Love Song: My Own Love Song is a 2010 road movie directed and written by Olivier Dahan and starring Renée Zellweger, Forest Whitaker, Madeline Zima and Nick Nolte.  It premiered in Dahan's native France on April 7, 2010 and in the United States at the Tribeca Film Festival between April 21 to May 2, 2010.

Supporting paragraphs: Sharon Maguire Bridget Jones's Diary (film)
Answer: Bridget Jones's Diary