"When diamonds are out of your budget ... buy ring pops instead! Just found out that it is #InternationalDiamondDay! ?❤️?? @chandlerpowell," Irwin wrote alongside a selfie of the two wearing matching ring pops.
Irwin and Powell met while he was visiting the Australia Zoo in November 2013 and later began dating long-distance. Last month, he dedicated a sweet post to Irwin on her 19th birthday.
"Happy Birthday for tomorrow to the kindest, strongest, most beautiful soul I have ever met," he began his post. "We have been together for years now and loving you will always be the greatest blessing. Every day I aspire to be more like you in the way you work tirelessly for what you believe in and the people you love most, all while carrying the most gorgeous smile."