Taylor Kinney praises ex Lady Gaga's 'A Star Is Born' success: 'The sky's the limit for her' (Exclusive)

Taylor Kinney can't stop gushing about ex-girlfriend Lady Gaga and her role in the critically acclaimed film A Star Is Born.

The Chicago Fire star spoke to ET on Saturday at the 2018 Carousel of Hope Ball at The Beverly Hilton Hotel, where he heaped praise upon his ex, who stars alongside Bradley Cooper in a remake of the 1937 classic. He told ET's Lauren Zima that he knew that Lady Gaga had it in her to crush a role like this.

"I’ll tell you that I’m really proud. I don’t know. It’s watching someone live their dream, so, continued success and I hope it keeps climbing," he told ET.  "The sky is the limit."

Kinney and Gaga got engaged on Valentine's Day in 2015, but split in 2016 after five years together. Despite the emotional breakup, the two have cheered one another on ever since. In September, Kinney gushed about how proud he was of her for taking on the role.

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Lady Gaga and Taylor Kinney's Relationship
CHICAGO, IL - MARCH 06: Actor Taylor Kinney and musician Lady Gaga enjoy watching the NHL game between the Chicago Blackhawks and the Detroit Red Wings at the United Center on March 6, 2016 in Chicago, Illinois. (Photo by Chase Agnello-Dean/NHLI via Getty Images)
PARK CITY, UT - MARCH 12: Lady Gaga and Taylor Kinney pose at Tupelo on March 12, 2016 in Park City, Utah. (Photo by Fred Hayes/Getty Images for Operation Smile)
BEVERLY HILLS, CA - FEBRUARY 28: Actor Taylor Kinney and recording artist Lady Gaga arrive at the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
BEVERLY HILLS, CA - FEBRUARY 28: Recording artist Lady Gaga, left, and Taylor Kinney arrive at the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by John Shearer/Getty Images)
CHICAGO, IL - MARCH 06: Lady Gaga and Taylor Kinney take part in the 16th Annual Polar Plunge at North Avenue Beach on March 6, 2016 in Chicago, Illinois. (Photo by Tasos Katopodis/Getty Images)
CHICAGO, IL - MARCH 06: Taylor Kinney and Lady Gaga take part in the 16th Annual Polar Plunge at North Avenue Beach on March 6, 2016 in Chicago, Illinois. (Photo by Tasos Katopodis/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 28: Recording artist Lady Gaga, left, and Taylor Kinney arrive at the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by John Shearer/Getty Images)
NEW YORK, NY - DECEMBER 12: Lady Gaga and Taylor Kinney are seen in SoHo on December 12, 2015 in New York City. (Photo by Alessio Botticelli/GC Images)
NEW YORK, NY - DECEMBER 11: Taylor Kinney (L) and Lady Gaga attend Billboard Women In Music 2015 on Lifetime at Cipriani 42nd Street on December 11, 2015 in New York City. (Photo by Kevin Mazur/Getty Images for Lifetime)
NEW YORK, NY - OCTOBER 19: Singer Lady Gaga and actor Taylor Kinney attend the 'Rock The Kasbah' New York Premiere at AMC Loews Lincoln Square on October 19, 2015 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
LOS ANGELES, CA - OCTOBER 03: Lady Gaga and Taylor Kinney arrives at the Premiere Screening Of FX's 'American Horror Story: Hotel' at Regal Cinemas L.A. Live on October 3, 2015 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
PARK CITY, UT - MARCH 14: Lady Gaga and Taylor Kinney attend Operation Smile's 4th Annual Celebrity Ski & Smile Challenge VIP Dinner on March 14, 2015 in Park City, Utah. (Photo by Kristin Murphy/Getty Images for Operation Smile)
WASHINGTON, DC - DECEMBER 07: Taylor Kinney and Lady Gaga arrive at the 37th Annual Kennedy Center Honors at the John F. Kennedy Center for the Performing Arts on December 7, 2014 in Washington, DC. (Photo by Paul Morigi/WireImage)
NEW YORK, NY - SEPTEMBER 05: Lady Gaga and Taylor Kinney attend Harper's Bazaar ICONS Celebration at The Plaza Hotel on September 5, 2014 in New York City. (Photo by Taylor Hill/FilmMagic)
NEW YORK, NY - SEPTEMBER 05: Lady Gaga and Taylor Kinney are seen on September 5, 2014 in New York City. (Photo by NCP/Star Max/GC Images)
NEW YORK, NY - SEPTEMBER 05: Lady Gaga and Taylor Kinney attend Samsung GALAXY At Harper's BAZAAR Celebrates Icons By Carine Roitfeld at The Plaza Hotel on September 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Samsung)
BEVERLY HILLS, CA - JANUARY 12: 71st ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actor Taylor Kinney and singer Lady Gaga attend Universal, NBC, Focus Features, E! Sponsored by Chrysler Viewing and After Party with Gold Meets Golden held at the Beverly Hilton Hotel on January 12, 2014 -- (Photo by Christopher Polk/NBC/NBC via Getty Images)
NEW YORK NY - MAY 13: Taylor Kinney and Lady Gaga sighting on May 13, 2014 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic)
NEW YORK, NY - SEPTEMBER 05: Lady Gaga and Taylor Kinney are seen heading out of Gaga's apartment building on September 5, 2014 in New York City. (Photo by Alessio Botticelli/GC Images)
BEVERLY HILLS, CA - JANUARY 12: 71st ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Actor Taylor Kinney and singer Lady Gaga attend Universal, NBC, Focus Features, E! Sponsored by Chrysler Viewing and After Party with Gold Meets Golden held at the Beverly Hilton Hotel on January 12, 2014 -- (Photo by Christopher Polk/NBC/NBC via Getty Images)
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On Saturday, he said he wasn't surprised that she nailed the character.

"No, there was no glass ceiling. Ever! She’s always inspiring and I really do – I hope it does really well, and I know it’ll mean the world to her that I think everybody is receptive and yeah, I wish her the best," he said.

The Carousel of Hope Ball he was attending is a biannual event to raise money to cure diabetes through the Children's Diabetes Foundation. It has raised more than $110 million dollars since its inception in 1978. Saturday's event was emceed by Jay Leno and featured an award given to Robert DeNiro.

"I was able to have a couple items up for auction – I got the entire cast of Chicago Fire to sign a helmet, a couple of the Cubs players to sign jerseys," Kinney told ET. "I feel humbled to be a part of [it] and I’m lucky to come."

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