Question: Serial Mom is a 1994 American crime film written and directed by John Waters, which American comedian, actress, writer, producer, and television host, made a cameo appearance in the film?
Context: Pink Flamingos is a 1972 American transgressive black comedy exploitation crime film directed, written, produced, filmed, and edited by John Waters.  It is part of what Waters has labelled the "Trash Trilogy", which also includes "Female Trouble" (1974) and "Desperate Living" (1977).  The film stars the countercultural drag queen Divine as a criminal living under the name of Babs Johnson, "the filthiest person alive".  While living in a trailer with Edie (Edith Massey) and Crackers (Danny Mills)—her mother and son respectively—and companion Cotton (Mary Vivian Pearce), Divine is confronted by the Marbles (David Lochary and Mink Stole), a couple of criminals envious of her reputation.  The characters engage in several grotesque, bizarre and explicitly crude situations. Robert Maier worked with filmmaker John Waters for fifteen years as a writer/producer/production manager on Waters' films "Polyester", "Hairspray", "Desperate Living", "Female Trouble", and "Cry-Baby", and with a dozen other low-budget movie-makers in Baltimore and New York City.  Maier created the 30-minute underground film "Love Letter to Edie", a documentary on the life and career of actress Edith Massey, and wrote the book "Low Budget Hell: Making Underground Movies with John Waters" about the making of the movies of John Waters. Serial Mom is a 1994 American crime film written and directed by John Waters, and starring Kathleen Turner as the title character, Sam Waterston as her husband, and Ricki Lake and Matthew Lillard as her children.  Patty Hearst, Suzanne Somers, Joan Rivers, Traci Lords, and Brigid Berlin make cameo appearances in the film. Ace Ventura: Pet Detective (or simply Ace Ventura, or also simply Pet Detective) is a 1994 American comedy film directed by Tom Shadyac, and co-written by and starring Jim Carrey.  It was developed by the film's original writer, Jack Bernstein, and co-producer, Bob Israel, for almost six years.  The film co-stars Courteney Cox, Tone Lōc, Sean Young and former Miami Dolphins quarterback Dan Marino.  In the film, Carrey plays Ace Ventura, an animal detective who is tasked with finding the Miami Dolphins' mascot that was abducted.  The film features a cameo appearance from death metal band Cannibal Corpse. Fresh is a 1994 American crime film written and directed by Boaz Yakin in his film directorial debut, also produced by Randy Oslow and Lawrence Bender (seen in a cameo appearance).  It was scored by Stewart Copeland, a member of The Police. Man of the House is a 2005 American crime comedy film directed by Stephen Herek and starring Tommy Lee Jones.  The main plot revolves around Lt. Roland Sharp (portrayed by Jones), a lonesome Texas Ranger who goes undercover as an assistant cheerleading coach to protect a group of college cheerleaders who have witnessed a murder.  Much of the film was shot in Austin, Texas on the University of Texas campus.  Texas Governor Rick Perry has a cameo appearance in the film as himself.  The house used in the film was The Star of Texas Inn. Leather Jacket Love Story is a 1997 film directed by David DeCoteau.  The film tells the story of poet Kyle (Sean Tataryn) who wants to find true love with Mike (Christopher Bradley), a handsome, aggressive older man who Kyle met on a one-night stand.  Mink Stole from "Hairspray" and "Serial Mom" fame plays Martine, and civil rights activist Morris Kight plays a cameo of himself. Blood Feast 2: All U Can Eat is a 2002 splatter film directed by Herschell Gordon Lewis.  It is a sequel to Lewis's 1963 cult classic original "Blood Feast".  Filmed under a working title of "Blood Feast 2: Buffet of Blood" and using the same grindhouse style as its predecessor, the film continues the story began in the original film, where a grandson of Fuad Ramses attempts to restart his grandfather's catering business.  The film features a cameo appearance by John Waters, a fan of Lewis' work. Joan Alexandra Molinsky (June 8, 1933 – September 4, 2014), widely known as Joan Rivers, was an American comedian, actress, writer, producer, and television host.  She was noted for her often controversial comedic persona—alternatingly self-deprecating or sharply acerbic, especially toward celebrities and politicians. Ace Ventura: When Nature Calls (also known as Ace Ventura 2 or Ace Ventura 2: When Nature Calls) is a 1995 American comedy film and the sequel to the 1994 American film "".  Jim Carrey reprises his role as the title character Ace Ventura, a detective who specializes in retrieval of tame and captive animals.  Ian McNeice, Simon Callow, and Sophie Okonedo co-star.  Tommy Davidson, who co-starred with Carrey on the show "In Living Color", makes a cameo appearance in the film.
Answer: Joan Rivers