"I said yes to the dress,” she captioned the picture, which showed the Australia Zoo conservationist wearing a dress with a long, broderie anglaise sleeve.
Fans were quick to note that the gown appears to be from designer Sareh Nouri's Bridal Fall 2019 collection, as an extremely similar $8,900 (AUD) dress stocked there.
Bindi’s caption also appears to be a clue as to which store the designer gown is from, as American reality show Say Yes To The Dress is filmed at Kleinfeld Bridal in New York.
In a further twist, Bindi’s wedding dress is also spookily similar to the one her mother, Terri wore when she married Steve Irwin in 1992.
Shortly after announcing her engagement to her pro-wakeboarder beau, Bindi revealed exactly how she planned to honour her late father on her special day.
"I think that for me, it'll be really important that Robert walks me down the aisle. That's something that I really want to do," she said at the time.