<a href="http://abcnews.go.com/topics/entertainment/actresses/joan-rivers.htm">Joan Rivers</a>&nbsp;attends A Celebration of Barbara Walters Cocktail Reception Red Carpet at the Four Seasons Restaurant, May 14, 2014, in New York.

Joan Rivers attends SiriusXM's "Howard Stern Birthday Bash" on Jan. 31, 2014 in New York City.

Melissa Rivers and Joan Rivers attend 92nd Street Y, Jan. 22, 2014, in New York.

TV personality Joan Rivers performs onstage at An Evening With Joan Rivers at American Jewish University on June 20, 2013 in Los Angeles.

Joan Rivers attends the Tribeca Film Festival 2010 portrait studio at the FilmMaker Industry Press Center, April 27, 2010, in New York.

Comedian Joan Rivers performs at the Stardust Resort &amp; Casino, June 26, 2004, in Las Vegas.

Comedienne, television and radio presenter Joan Rivers, London, 1992.

American comedienne television and radio presenter Joan Rivers, is seen with a doorman at the Ritz Hotel, London in the early 1990's.

Joan Rivers is seen during 17th Annual Daytime Emmy Awards at Marriott Marquis Hotel in New York, June 28, 1990.

Actor Emmanuel Lewis is seen during an interview with guest host Joan Rivers, Jan. 27, 1986, on the The Tonight Show Starring Johnny Carson.

Promotional portrait of American comedian and actor Joan Rivers seen here in the 1980's.

Comedienne Joan Rivers with daughter Melissa and husband Edgar Rosenberg attend "Sunday in the Park With George," in this undated photo.

Comedienne Joan Rivers lights a cigar for her husband, Edgar Rosenberg, shortly after the arrival of her daughter, Melissa, who was born on Jan. 20, 1968 at Lenox Hill Hospital in New York.

Comedian Joan Rivers poses for a portrait in 1968 in New York.