Answer: The First Wives' Club
The movie, "The First Wives' Club" (1996) is based on the book of the same name by Olivia Goldsmith. The "first wives" in "The First Wives Club" were played by Dianne Keaton (as Annie), Goldie Hawn (as Elise) and Bette Midler (as Brenda). At the beginning of the movie, they attend the funeral of a fourth friend, Cynthia (played by Stockard Channing). The author, Olivia Goldsmith, makes a cameo appearance at Cynthia's funeral.
The movie had a star-studded cast, including Maggie Smith, Sarah Jessica Parker, Bronson Pinchot, and Rob Reiner. Other real-life celebrities who appeared as themselves included Ivana Trump, Kathie Lee Gifford, Gloria Steinem, and Ed Koch.