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From left, Rosie O'Donnell, Liza Minnelli and Cyndi Lauper perform at the Barclays Center on Friday, May 9, 2014 in New York. (Photo by Greg Allen/Invision/AP) ( Cyndi Lauper Performs at The Barclays Center )

From left, Cyndi Lauper, Liza Minnelli and Rosie O'Donnell perform at the Barclays Center on Friday, May 9, 2014 in New York. (Photo by Greg Allen/Invision/AP) ( Cyndi Lauper Performs at The Barclays Center )

Lorna Luft, Joseph Luft and Liza Minnelli arrive at the Oscars on Sunday, March 2, 2014, at the Dolby Theatre in Los Angeles. (Photo by Jordan Strauss/Invision/AP) ( 86th Academy Awards - Arrivals )

In this March 2, 2014 file photo, Liza Minnelli arrives at the Oscars in Los Angeles. Minnelli is said to be resting comfortably in a California hospital after undergoing back surgery this week and she’s thanking fans for their well wishes. Minnelli’s back injury had prevented her from performing most of the year or attending the funeral of Joan Rivers in New York this month. (Photo by Jordan Strauss/Invision/AP) ( People-Liza Minnelli )

Liza Minnelli arrives at the 20th annual Screen Actors Guild Awards at the Shrine Auditorium on Saturday, Jan. 18, 2014, in Los Angeles. (Photo by Paul A. Hebert/Invision/AP) ( 20th Annual SAG Awards - Arrivals )

Liza Minnelli attends the amfAR Inspiration Gala at the The Plaza Hotel on Thursday, June 13, 2013 in New York. (Photo by Brad Barket/Invision/AP) ( amfAR Inspiration Gala )

U.S singer Liza Minnelli performs at the Royal Festival Hall in London on Friday, March 1st, 2013. (Photo by Jonathan Short/Invision/AP) ( Liza Minnelli Performs in London )

Liza Minnelli and Robert De Niro attend the premiere of "Mistaken For Strangers" during the opening night of the 2013 Tribeca Film Festival on Wednesday April 17, 2013 in New York. (Photo by Charles Sykes/Invision/AP) ( Mistaken for Strangers Premiere NY )

Actress Liza Minnelli attends the "Cabaret" 40th anniversary screening, at the Ziegfeld Theatre on Thursday, Jan. 31, 2013 in New York. (Photo by Andy Kropa/Invision/AP) ( Cabaret 40th Anniversary Screening )

Liza Minnelli performs at the 2011 TV Land Awards on Sunday, April 10, 2011, in New York. (AP Photo/Charles Sykes) ( 2011 TV Land Awards Show )

Liza Minnelli performs at the 2011 TV Land Awards on Sunday, April 10, 2011, in New York. (AP Photo/Charles Sykes) ( 2011 TV Land Awards Show )

Liza Minnelli attends the premiere of "Sex And The City 2" at Radio City Music Hall in New York on Monday, May 24, 2010. (AP Photo/Peter Kramer) ( Premiere Sex And The City 2 NY )

Liza Minnelli attends the opening night performance of the Broadway musical "Promises, Promises" in New York, Sunday, April 25, 2010. (AP Photo/Charles Sykes) ( Promises Promises Opening Night )

Singer Liza Minnelli performs a concert at the Hollywood Bowl, Friday, Aug. 28, 2009, in Los Angeles. (AP Photo/Mark J. Terrill) ( Liza Minnelli Concert )

Actor Liza Minnelli arrives at the 63rd Annual Tony Awards in New York, Sunday, June 7, 2009. (AP Photo/Peter Kramer) ( Tony Awards Arrivals )

American actress and singe Liza Minnelli poses in front of Rome's famous Trevi Fountain during a photo-call to present her "The True Diva" live tour 2008, in Rome, Oct. 2, 2008. The tour, which opens in Italy on Oct. 29 in Rome, will touch seven Italian cities including Milan which last hosted a Liza Minnelli concert 19 years ago. (AP Photo/Pier Paolo Cito) ( ITALY LIZA MINNELLI )

Actress Liza Minnelli poses for pictures during her dress rehearsal for her upcoming musical "Liza's at the Palace" in New York on Friday, Oct. 24, 2008. (AP Photo/Peter Kramer) ( Liza Minnelli Dress Rehearsal )

Liza Minnelli poses with producers Neil Meron, left, and Craig Zadan, right, during arrivals to the New York premiere of the film 'Hairspray', Monday, July, 16, 2007. (AP Photo/Stuart Ramson) ( Hairspray )

Liza Minnelli and Tony Danza speak with a reporter Monday, March 13, 2006 in New York. Danza was on hand to celebrate Minnelli's 60th birthday and attend the viewing of the restored 1972 TV concert event "Liza With A Z".(AP Photo/Stephen Chernin) ( LIZA WITH A Z )

Top model Heidi Klum, Fashion Designer Donatella Versace and American singer Liza Minnelli, from left, pose for the photographers during a pressconference for the upcoming Austrian Aids Charity Gala "Life Ball" on Saturday May, 21. 2005 in Vienna. Donatella Versace stages this year's fashion show during the "Life Ball" opening ceremony. (AP Photo/Ronald Zak) ( AUSTRIA AIDS CHARITY )

Actress Sharon Stone, wearing Chopard jewelry, and actress Liza Minnelli perform during the auction at "Cinema Against AIDS 2004", the 11th annual event in aid of amfAR (American Foundation for AIDS Research) at Le Moulin de Mougins at the 57th Cannes Film Festival on May 20, 2004 in Cannes, France. (Photo by Evan Agostini/Getty Images) ( 50853777EA001_amfar )

Singer Liza Minnelli performs at The HELP Group's 7th Annual "Teddy Bear Ball" honoring Fox Television Entertainment Group Chairman Sandy Grushow and his wife Barbara held on December 6, 2003 at the Beverly Hilton Hotel, in Beverly Hills, California. (Photo by Kevin Winter/Getty Images) ( 2785609KW011_help )

Liza Minnelli and husband David Gest backstage during "KTU's Miracle on 34th Street" hoilday concert at Madison Square Garden in New York City. December 18, 2002. Photo by Scott Gries/ImageDirect ( KTU's Miracle on 34th Street Holiday Concert )

Actor Ben Vereen and actress Lisa Minnelli attend the Hollywood Beautification Team 3rd Annual Award Gala Dinner November 14, 2001 in Los Angeles, CA. Vereen was honored at the event. (Photo by Frederick M. Brown/Getty Images) ( 39723403beau_20011115_00031.jpg )

Performer Liza Minnelli is wheeled out of the hospital by her half-sister Lorna Luft October 30, 2000 after being released from the Cleveland Clinic Hospital in Fort Lauderdale, Florida. The entertainer, who has been battling viral encephalitis, was released from the hospital after being treated for dehydration. (Photo by Robert King/Newsmakers) ( 38105206minn_20010628_16880.jpg )

Performer Liza Minnelli Smells A Rose. Minnelli Is In An Elite Group Of Artists To Have Achieved The "Quadruple Crown" Of Entertainment Honors Having Won Three Tony Awards, An Oscar, Two Golden Globe Awards And An Emmy. (Photo By Getty Images) ( 38200501minn_20010630_00990.jpg )

A portrait taken on October 16, 1987 shows US actress and singer Liza Minelli in Paris. (PIERRE GUILLAUD/AFP/Getty Images) ( ARP2918051 )

14th August 1979: American actress, singer and dancer Liza Minnelli, centre, with muppets Kermit the Frog and Zoot on the set of the TV show 'The Muppets' at Elstree Studios, London. (Photo by Central Press/Getty Images) ( 97i/17/huty/6872/40 )

12th June 1973: American actress and singer Liza Minnelli, right, with her sister Lorna Luft, who she met at London Airport on her arrival from the United States. (Photo by Monti Spry/Central Press/Getty Images) ( 97p/25/huty/7292/33 )

US entertainer Liza Minelli performs in Deauville, on August 21, 1971. (ARCHIVE/AFP/Getty Images) ( ARP2918032 )

circa 1960: American film actress and singer Judy Garland (1922 - 1969) (right) with her daughter, actress, singer and dancer Liza Minnelli. (Photo by Hulton Archive/Getty Images) ( 97k/21/huty/7095/37 )

4th November 1960: American film star, Judy Garland (1922 - 1969) with her husband, film producer, Sid Luft and their children, Liza (14), Lorna (7) and Joe (5) at their home in Chelsea, London. (Photo by Chris Ware/Keystone Features/Getty Images) ( 00d/21/huty/14637/13 )

9th July 1951: Liza Minnelli saying goodbye to her father, film director Vincente Minnelli (1913 - 1986) aboard the Queen Elizabeth just before sailing to join her mother Judy Garland who is on tour in Europe. (Photo by Keystone/Getty Images) ( 98l/48/huty/12963/07 )

Portrait of singer and actor Judy Garland (1922-1969) with her toddler daughter Liza Minnelli on the set of the film 'Words and Music,' 1948. (Photo by Hulton Archive/Getty Images) ( T200000_P2048_394 )

28th May 1947: American actress Judy Garland (1928 - 1969) holding her and film director Vincente Minnelii's daughter Liza, who later became famous in her own right as an actress and singer. (Photo by Keystone/Getty Images) ( 97p/24/huty/7244/18 )

5th May 1966: American singer and actress Liza Minnelli, the daughter of actress Judy Garland and director Vicente Minnelli, who won an Academy Award for her role in 'Cabaret'. (Photo by Larry Ellis/Express/Getty Images) ( 99t/18/huty/13361/25 )