Carrie Underwood 'Can't Believe' She Made a Surprise Cameo on 'Cobra Kai' 's 4th Season: 'So Much Fun'

"Once I discovered Cobra Kai a few years ago, it became one of my favorite shows!" the singer said of the series, which is now streaming its fourth season on Netflix

Photo: Curtis Bonds Baker/Netflix

In case you missed it, Cobra Kai's much-anticipated fourth season featured a surprise cameo from Carrie Underwood.

The "Before He Cheats" singer, 38, appeared on the season's penultimate episode. As Daniel LaRusso's Miyagi-Do, Johnny Lawrence's Eagle Fang and John Kreese's Cobra Kai competed in the All Valley Under 18 Karate Tournament, Underwood appeared at the event to perform "The Moment of Truth." The song was previously performed by Survivor for the Karate Kid soundtrack in 1984.

"I grew up watching Daniel and Johnny, and I can't believe I actually get to be a small part of the legacy that is The Karate Kid," the Grammy winner said in a statement. "Once I discovered Cobra Kai a few years ago, it became one of my favorite shows!"

"I had so much fun being on the set and singing such a classic song," she added. "I cannot wait to watch every new episode!"

"Carrie was absolutely amazing on set," Cobra Kai co-creator and executive producer Jon Hurwitz tells PEOPLE. "It was a joy having her join us and seeing her get just as starstruck by our cast as they were by her!"

Curtis Bonds Baker/Netflix

On the day the new episodes dropped, Underwood celebrated the launch by posting a photo of herself dressed in an Eagle Fang Karate gi. She was also pictured holding a glass of champagne.

"Tonight's plans involve champagne and @cobrakaiseries!" she captioned the post. "I'm pretty sure @william_zabka stole this from wardrobe to give to me, but it's being put to good use! 🐍 🐍🐍 🦅 🦅🦅 🥋 🥋🥋🥂🥂 🥂 Cheers, everyone!"

After Underwood tweeted in 2020 about how "awesome" Cobra Kai is, Hurwitz says he and fellow creators, Josh Heald, and Hayden Schlossberg, didn't hesitate to reach out to her about making a cameo.

"In the world of The Karate Kid, the All Valley Under 18 Karate Tournament is basically the Super Bowl — only it takes place in a gymnasium and the sponsors are local car dealers and sandwich shops," Hurwitz explains to PEOPLE. "We thought it would be funny if one of the characters who helps put on the event each year constantly talks about having a celebrity guest in attendance but never comes through, only to pull it off unexpectedly in a spectacular way this year."

"We knew Carrie and her family were big Cobra Kai fans, because she tweeted about the show when we first hit Netflix, so we figured we'd shoot for the moon and see if she'd like to come and play," he continues. "We needed a well-known singer who could crush a cover of Survivor's 'Moment of Truth' and simultaneously shock the All Valley crowd (and our fanbase) by simply appearing."

"Who better than Carrie Underwood!?" he adds. "When her team responded with a 'she'd love to!' we were blown away and quickly off to the races."

On the day Underwood filmed her scene, Hurwitz says the entire cast and crew were beyond excited.

"We'll never forget how nervous we were going over to the tour bus to meet her for the first time, only to find out that she had just as many butterflies as we did," he says. "She was so excited to share the screen with all of her favorite characters from the show."

Curtis Bonds Baker/Netflix

"The funny thing is that we never actually told the 300 extras on set that day that she was about to appear so the excitement you're watching is authentic," he notes. "Carrie could not have been more friendly and gracious to every member of the cast and crew. She hung around for hours after shooting, taking photos and chatting with everyone."

In an interview with Entertainment Weekly, fellow creator Hayden Schlossberg also explained why Underwood didn't perform Joe Esposito's "You're the Best," which previously played during the original Karate Kid film's tournament scene.

"We felt that if we just did that song, it would just be a copycat of what the movie was," he explained. "We love this song, 'The Moment of Truth.' It's a little bit less known, and yet it still has that same 1980s sports-rock anthem vibe. So to have her sing that, it gave that same vibe to the tournament without doing the exact same thing."

RELATED VIDEO: Ralph Macchio Says Nostalgia for 'Karate Kid' Has Never Gone Away: "It's Just Incredible"

Taking place years after the events in the iconic Karate Kid film series, Cobra Kai sees Daniel LaRusso (Ralph Macchio) and Johnny Lawrence's (William Zabka) martial arts rivalry reignited decades after their 1984 match at the All Valley Karate Tournament.

Martin Kove, Courtney Henggeler, Xolo Maridueña, Tanner Buchanan, Mary Mouser, Jacob Bertrand, Gianni DeCenzo, Peyton List, Vanessa Rubio and Thomas Ian Griffith are also in the cast.

Season 4 of Cobra Kai is now streaming on Netflix.