Matt Damon talks daughter's 'really bad' jellyfish incident, what George Clooney is like as a dad

Matt Damon getaway to Australia wasn't exactly relaxing!

The 47-year-old actor was a guest on Thursday's episode of The Ellen DeGeneres Show, where he opened up about his family's April vacation with Australian actor Chris Hemsworth. Damon recounts the not-so-fun moment when his 7-year-old daughter, Stella, had a scary incident at Byron Bay.

"Australia's famous for having a lot of poisonous things, and I'm telling my kids, 'Don't worry. It's fine,'" he remembers. "And Chris is like, 'Oh, you'll be fine. Come on over.' And my daughter, my [youngest], got stung by a jellyfish."

"It was the worst thing," he adds. "I mean, even Chris said, he was like, 'Mate, that's the worst thing I've ever seen in my life.' Like, it was really bad. She was in a little bit of surf, in about a foot or two of water... this thing literally wrapped around her. I could show you pictures that would turn your head. She had these, it looked like red shoelaces around her body."

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Matt Damon through the years
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Brendan Fraiser, Matt Damon, Randel Batinkoff and Guest at the Academy Theater in Beverly Hills, California (Photo by Ron Galella/WireImage)
Matt Damon (Photo by Ron Galella/WireImage)
Matt Damon (Photo by Jim Smeal/WireImage)
Matt Damon at the Radio City Music Hall in New York City, New York (Photo by Kevin Mazur/WireImage)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1274 -- Pictured: (l-r) Actor Matt Damon during an interview with host Jay Leno on December 1, 1997 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
Matt Damon during 55th Annual Golden Globe Awards at Beverly Hilton Hotel in Beverly Hills, California, United States. (Photo by SGranitz/WireImage)
BOSTON, : Oscar winning actor Matt Damon from Cambridge, Massachusetts, signs autographs prior to the Home-Run Derby during the 70th Baseball All-Star Week12 July, 1999, at Fenway Park in Boston, Massachusetts. The All-Star will be played 13 July between the American and National Leagues. (ELECTRONIC IMAGE) AFP PHOTO/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images)
368219 04: Actor Matt Damon stars as Rannulph Junuh in Robert Redford's The Legend of Bagger Vance, to be distributed domestically by DreamWorks. (Photo by David James/Newsmakers)
385569 20: (NO WHO WEEKLY) FILE PHOTO: Actor Matt Damon attends the world premiere of his new film 'All The Pretty Horses' December 10, 2000 at the Beekman Theater in New York City. A Rhodesian Ridgeback dog who resembles actor Matt Damon 'especially in the eyes' says his owner, participated in an audition for pets that look like celebrities February 15, 2001 at Universal Studios in Burbank, CA. The dog was one of several dozens pets competing for a video spot on 'Animal Planet Live', a new attraction at Universal Studios. (Photo by Robin Platzer/Liaison)
PRAGUE, CZECH REPUBLIC - JANUARY 12: (Publicist approval required for ALL usages) Actor Matt Damon on the set during filming of 'The Bourne Identity' on January 12, 2001 in Prague, Czech Republic. (Photo by Daniel Smith/Getty Images)
LONDON, ENGLAND - SEPTEMBER 24: Matt Damon attends the European premiere of 'The Martian' at Odeon Leicester Square on September 24, 2015 in London, England. (Photo by Karwai Tang/WireImage)
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MORE: Matt Damon's 6-Year-Old Daughter Reportedly Stung By Jellyfish During Family Vacation With Chris Hemsworth

Damon continues on, telling host Ellen DeGeneres he and Hemsworth had to physically pull it off Gia.

"[I got stung] a little bit, but not like her," he explains, adding that neither of them peed on her, a method that is supposed to help ease the pain of a jellyfish sting. "That's what they say you're supposed to do, but -- at this point, you know, she peed on me enough in her life. But, no. In fact, there was enough around her chest that a lot of locals said, 'You should actually call the paramedics,' because you can go into shock."

"They showed up and said, 'Actually, hot water [helps],'" he adds. "Like if you put her in a hot bath and just gently sponge away [the stings]. They stick to you with these little needles, basically. It's really painful."

In addition to Stella, Damon and his wife, Paige, are also parents to daughters Isabella, 11, Alexia, 18, and Gia, 9, so the two definitely know a thing or two about the highs and lows of raising girls. Later in the show, DeGeneres asks Damon if he has any parenting advice for his Suburbicon co-star, George Clooney, who is a new dad to twins Alexander and Ella with wife Amal.

"It took him into his fifties but I think he grew up, finally," Damon jokes. "No, he's loving it. He's great. He's a lot calmer than I -- with twins, that's a lot of work. But he did confide in me that they went onto solid foods last week, so he's trying to get off diaper duty now. Because that's a whole other level."

"He was like, 'Diapers are easy!' and I was like, 'Wait for it,'" he adds. "The twins thing, people ask me if I give him and advice and I'm like, 'No. Two babies at once? That's horrific.'"

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George Clooney and Amal Clooney together
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PARIS, FRANCE - FEBRUARY 24: George Clooney and Amal Clooney arrive at the Cesar Film Awards 2017 at Salle Pleyel on February 24, 2017 in Paris, France. (Photo by Fran�is Pauletto/Corbis via Getty Images)
(FILES) File photo dated February 24, 2017 shows US actor George Clooney and his wife British-Lebanese lawyer Amal Clooney as they arrive for the 42nd edition of the Cesar Ceremony at the Salle Pleyel in Paris. The couple welcomed their twin babies, Ella and Alexander, June 6, 2017 in London, the actor's publicist said. The 39-year-old human rights lawyer and 56-year-old Hollywood star -- both first-time parents -- tied the knot in Venice in 2014. / AFP PHOTO / bertrand GUAY (Photo credit should read BERTRAND GUAY/AFP/Getty Images)
PARIS, FRANCE - FEBRUARY 24: George Clooney and Amal Clooney arrive at the Cesar Film Awards Ceremony at Salle Pleyel on February 24, 2017 in Paris, France. (Photo by Rindoff/Charriau/Getty Images)
LONDON, ENGLAND - JANUARY 09: George and Amal Clooney attend the Netflix special screening and reception of The White Helmets hosted by The Clooney Foundation For Justice with George and Amal Clooney, at the Bvlgari Hotel on January 9, 2017 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images for Netflix )
NEW YORK, NY - SEPTEMBER 20: (AFP OUT) Actor George Clooney (L) and wife Amal Clooney attend a Leaders Summit for Refugees during the United Nations 71st session of the General Debate at the United Nations General Assembly on September 20, 2016 in New York, New York. (Photo by Peter Foley - Pool/Getty Images)
CANNES, FRANCE - MAY 12: George Clooney and Amal Clooney attend the 'Money Monster' Premiere during the 69th annual Cannes Film Festival on May 12, 2016 in Cannes, France. (Photo by Tony Barson/FilmMagic)
VATICAN CITY, VATICAN - MAY 29: George Clooney and Amal Clooney attend 'Un Muro o Un Ponte' Seminary held by Pope Francis at the Paul VI Hall on May 29, 2016 in Vatican City, Vatican. (Photo by Franco Origlia/Getty Images)
(FILES) File photo dated February 11, 2016 shows US actor George Clooney (R)and his wife Amal arrive at the 66th Berlinale Film Festival in Berlin. George and Amal Clooney welcomed their twin babies, Ella and Alexander, on June 6, 2017 in London, the actor's publicist Stan Rosenfeld said. The 39-year-old human rights lawyer and 56-year-old Hollywood star -- both first-time parents -- tied the knot in Venice in 2014. / AFP PHOTO / John MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
WESTWOOD, CA - FEBRUARY 01: Amal Clooney and George Clooney arrive at the premiere of Universal Pictures' 'Hail, Caesar!' at Regency Village Theatre on February 1, 2016 in Westwood, California. (Photo by Gregg DeGuire/WireImage)
WESTWOOD, CA - FEBRUARY 01: George Clooney and Amal Clooney arrives at the Premiere Of Universal Pictures' 'Hail, Caesar!' at Regency Village Theatre on February 1, 2016 in Westwood, California. (Photo by Steve Granitz/WireImage)
Lawyer Amal Alamuddin Clooney and Actor George Clooney arrive at the premiere of 'Our Brand In Crisis' held at the TCL Chinese Theater in Hollywood. (Photo by Frank Trapper/Corbis via Getty Images)
HOLLYWOOD, CA - OCTOBER 26: Amal Clooney and George Clooney attend the premiere of 'Our Brand Is Crisis' at TCL Chinese Theatre on October 26, 2015 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - SEPTEMBER 29: George Clooney (L) and Amal Clooney are seen in Midtown on September 29, 2015 in New York City. (Photo by Michael Stewart/GC Images)
IBIZA, SPAIN - AUGUST 23: (L-R) Michael Meldman, Monica Gambee, Amal Alamuddin, George Clooney, Rande Gerber and Cindy Crawford host the official launch of Casamigos Tequila in Ibiza, at Ushuaia Ibiza Beach hotel on August 23, 2015 in Ibiza, Spain. (Photo by Europa Press/Europa Press via Getty Images)
IBIZA, SPAIN - AUGUST 23: Amal Clooney (L) and Founder of Casamigos Tequila George Clooney attend as Casamigos founders Rande Gerber, George Clooney and Mike Meldman host the official launch of Casamigos Tequila in Ibiza and Spain at Ushuaia Ibiza Beach Hotel on August 23, 2015 in Ibiza, Spain. (Photo by David M. Benett/Dave Benett/Getty Images for Casamigos Tequila)
US movie star George Clooney (R), accompanied by his wife Amal (L), arrives at Haneda airport in Tokyo on May 24, 2015. Clooney is now here for the Japanese premiere of his new film 'Tomorrowland', a retro-futuristic spectacle mixing environmental themes with sci-fi wizardry. AFP PHOTO / Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
TOKYO, JAPAN - MAY 25: Lawyer Amal Clooney (R) and actor George Clooney (L) attends the Tokyo premiere of 'Tomorrowland' at Roppongi Hills on May 25, 2015 in Tokyo, Japan. (Photo by Atsushi Tomura/Getty Images)
ANAHEIM, CA - MAY 09: (L-R) Mia Alamuddin, actor George Clooney and lawyer Amal Clooney attend the premiere of Disney's 'Tomorrowland' at AMC Downtown Disney 12 Theater on May 9, 2015 in Anaheim, California. (Photo by Alberto E. Rodriguez/Getty Images for Disney)
NEW YORK, NY - MAY 04: Actor George Clooney and lawyer Amal Clooney attend the 'China: Through The Looking Glass' Costume Institute Benefit Gala at the Metropolitan Museum of Art on May 4, 2015 in New York City. (Photo by Axelle/Bauer-Griffin/FilmMagic)
NEW YORK, NY - MAY 02: Amal Clooney and George Clooney are seen on May 2, 2015 in New York City. (Photo by NCP/Star Max/GC Images)
NEW YORK - APRIL 28: Amal Clooney, George Clooney get dinner at Caravaggio in Upper East Side on APRIL 28, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - MARCH 07: George Clooney and Amal Clooney get dinner at Kappo Masa sushi restaurant in Upper East Side seen out in the Big Apple in yellow on MARCH 07, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
BEVERLY HILLS, CA - JANUARY 11: Actor George Clooney (L) and Amal Clooney attend the 72nd Annual Golden Globe Awards at The Beverly Hilton Hotel on January 11, 2015 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
George and Amal leave Venice town hall Ca'Farsetti after their civil marriage cerimony (Photo by Giulia Candussi/Corbis via Getty Images)
VENICE, ITALY - SEPTEMBER 29: George Clooney and Amal Alamuddin sighted on the way to their civil wedding at Canal Grande on September 29, 2014 in Venice, Italy. (Photo by Robino Salvatore/GC Images)
VENICE, ITALY - SEPTEMBER 28: George Clooney and Amal Alamuddin leave the Aman Hotel on September 28, 2014 in Venice, Italy. George Clooney is set to marry his lawyer fiancee Amal Alamuddin this weekend in Venice where they met. (Photo by PVS/GC Images)
VENICE, ITALY - SEPTEMBER 26: George Clooney and Amal Alamuddin arrive in Venice on September 26, 2014 in Venice, Italy. George Clooney is set to marry his lawyer fiancee Amal Alamuddin this weekend in Venice where they met. (Photo by PVS/GC Images)
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WATCH: George Clooney 'Debuts' His Twins With the Help of Manny Matt Damon

ET caught up with Clooney over the weekend, where he revealed his twins' latest milestone and his family's Halloween plans.

"We're still getting used to having human beings in our life," he shared. "Two little human beings that we are responsible for. But it's pretty funny and it's wild."

"This is an important part of my life's journey and this is really, truly the largest step in fatherhood for me at this point," he added. "Three days ago, my children started on what we would call solid food. I don't know how it goes in as a carrot and it comes out the way it comes out. But it was shocking. It was shocking what has changed. And I think it may never go back. I think it's going to be that way forever now, and it was terrifying."

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