The 17-year-old took to Instagram, sharing a year-old photo of her and her boyfriend Chandler Powell on prom night.
"We don't really have Prom in Australia but this wonderful human being is American and when his prom came around he invited me to Florida to go with him," Irwin captioned a four-photo collage.
The outing was full of quintessential prom staples: a corsage, color-coordinated outfits, a teacup dress and an excessive amount of photos.
Irwin's family would all for the event, with her little brother Robert striking an attention-grabbing pose in one snap, and her mother, Terri, sporting a wide smile.
"I can't believe this really happened, I felt like I was living in a movie and was a real life Disney princess," the season 21 Dancing with the Stars champ continued.
"Gosh I'm blessed. Thank you @chandlerpowell it meant the world to me."
Irwin and 19-year-old Powell, who lives in America began dating in 2013 and regularly visit each other, taking trips and sharing Instagram posts.
Last month, the star passed a giant milestone: she got her provisional driver's license – and did so in her dad's old car!
"It was wonderful to take my test in St George and pass the first time in my Dad's giant old ute!" Irwin captioned a photo of herself posing proudly with her new P-plate.