Why Liza Minnelli is concerned about Renée Zellweger's Judy Garland biopic (Exclusive)

Liza Minnelli will forever protect mother Judy Garland's legacy.

ET exclusively caught up with the 73-year-old actress ahead of the opening of the newly renamed Feinstein's supper club at upstairs Vitello's in Studio City, California, where she shared her concerns about the upcoming biopic on her legendary mom.

Simply titled Judy, the new Rupert Goold-directed film stars Renée Zellweger as Garland and will be released on Sept. 27. ET's Nischelle Turner spoke with Minnelli about the project, who claims she hasn't seen any of the trailers.

"Oh, really? No, no I haven't [seen anything]," she admitted, before crediting Zellweger as "a wonderful" actress. "I just hope they don't do what they always do. That's all I've got to say."

Back in 1954, Garland starred as Vicki Lester in A Star Is Born, which was famously remade last year with Lady Gaga in the lead role of Ally. ET asked Minnelli what she thinks her mother would have said about the pop star's performance if she were still alive today.

"She would have laughed," Minnelli said. "And then she would have gotten into it."

"I can hear her saying, 'OK, let's go!'" she added. "Great to the end!"

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Judy Garland
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Judy Garland
Headshot of American actor and singer Judy Garland (1922-1969) wearing a bracelet, circa 1950s. (Photo by Hulton Archive/Getty Images)
Comic actor Jimmy Durante (1893 - 1980) with child star Judy Garland (1922 - 1969), the entertainer and leading lady. (Photo by General Photographic Agency/Getty Images)
circa 1931: Judy Garland (1922 - 1969) formerly Frances Gumm was part of a show biz family that toured in vaudeville. She starred in 'The Wizard of Oz' and 'A Star is Born' . She married five times, and though a legendary performer, had a reputation for being difficult. Viewed at a tea party. (Photo by Hulton Archive/Getty Images)
American actors Bert Lahr (1895 - 1967) (far right), Ray Bolger (1904 - 1987) (back row, right), Judy Garland (1922 - 1969) (sitting, right), composer Harold Arlen (1905 - 1986) (sitting left), and various MGM and music publishing executives sing songs from the 1939 film musical 'The Wizard of Oz' around a microphone in the NBC radio studio, circa 1939. (Image by Hulton Archive/Getty Images)
1945: Film director Vincente Minnelli (1903 - 1986) kisses singer and actress Judy Garland (1922 - 1969) on the brow at their wedding. (Photo by Keystone/Getty Images)
1944: American film actress Judy Garland (Frances Ethel Gumm, 1922 - 1969) at home answering fan mail. (Photo by Hulton Archive/Getty Images)
American actor and singer Judy Garland (1922-1969) holds her hands up near her face, circa 1950s.(Photo by Hulton Archive/Getty Images)
17th October 1957: American film star and entertainer Judy Garland (1922 - 1969) performing on stage at the Dominion Theatre in London. (Photo by Terry Fincher/Keystone/Getty Images)
American actor and singer Judy Garland (1922-1969) stands arm in arm with actor Rosalind Russell (1907 - 1906), circa 1960s. (Photo by Hulton Archive/Getty Images)
6th April 1951: Judy Garland, born Frances Gumm (1922-1969), US film actress and singer, at the Dorchester Hotel. (Photo by Express/Express/Getty Images)
8th April 1951: American actress and singer Judy Garland (1922 - 1969) holds her hat on as she takes a walk in London in strong winds. (Photo by J. Wilds/Keystone/Getty Images)
circa 1955: Singer and film star, Judy Garland (1922 - 1969) at an airport. (Photo by Keystone/Getty Images)
17th October 1957: Hollywood entertainer Judy Garland, 'Miss Showbusiness' as she is known, performing at the opening of her new show at the Dominion theatre in London. (Photo by Keystone/Getty Images)
American actress and singer Judy Garland (1922 - 1969), in her London hotel suite. She arrived with her three children Joey, Lorna and Liza, following a reported attempt by her husband, producer Sid Luft, to declare her 'an unfit mother'. (Photo by Keystone/Getty Images)
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Earlier in the interview, Minnelli also opened up about what it was like getting "Liza," an entire bar and lounge area dedicated to her at Feinstein's. The '40s-style lounge was recently transformed by Michael Feinstein, her best friend of 35 years.

"I wanted to create a space that was just for Liza. So we have Liza's room now," Feinstein shared. "We met at a nightclub, [so] it's fitting. l was playing a Christmas party and Liza came by. She heard me playing a song and I lost a line. I lost a lyric, and she threw the lyric to me. I said, 'Thank you.' She said, 'You're welcome.'"

"She kept going, then she came back and sat down next to me and said, 'From now on, we're going to be joined at the hip,'" the 62-year-old pianist continued. "And I went, 'Haha, yeah right.' And that's what happened."

Despite their close friendship, Minnelli was still shocked to learn Feinstein was creating a special space just for her in his supper club.

"Uh, please. I couldn't believe it really," Minnelli said. "[Like], 'Huh, what are we doing?'"

As for how the club and partnership with Vitello's came to be, Feinstein told ET he had been wanting a nightclub in Los Angeles for a long time. "That's how my career started," he explained. "LA's never been a late night place because people get up early to work, but there are those of us who come alive after dark."

"These songs [we'll be performing] shouldn't be sung when it's daylight outside," he continued. "At lunch, you don't sing, 'Love for sale,' or 'Food, glorious food,' but the point is, that I felt that it was time for Los Angeles to have a speakeasy atmosphere and a club that pays homage to the classic nightclubs."

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Lady Gaga attends the 2019 Oscars
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Lady Gaga attends the 2019 Oscars
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Steve Granitz/WireImage)
Best Original Song nominee for 'Shallow' from 'A Star is Born' Lady Gaga arrives for the 91st Annual Academy Awards at the Dolby Theatre in Hollywood, California on February 24, 2019. (Photo by Mark RALSTON / AFP) (Photo credit should read MARK RALSTON/AFP/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
Best Original Song nominee for 'Shallow' from 'A Star is Born' Lady Gaga arrives for the 91st Annual Academy Awards at the Dolby Theatre in Hollywood, California on February 24, 2019. (Photo by Mark RALSTON / AFP) (Photo credit should read MARK RALSTON/AFP/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Matt Winkelmeyer/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 24: Lady Gaga attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
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