Speaking at the party, Bindi said she wished her late dad could be with her as she celebrated the milestone, with the Crocodile Hunter’s image a strong presence on her big day.
Bindi's brother Robert Irwin, will also play a role in her upcoming wedding.
"I'm walking Bindi down the aisle, which is just gonna be awesome," the 15-year-old said on The Tonight Show Starring Jimmy Fallon.
Bindi told Entertainment Tonight: "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."
"I’m always so grateful that Robert is there, and he has been such a big part of my life and he’s always stepped up and been the one to give me a hug when I need it and encourage me forward in life," Bindi added.
"So he will definitely be the one to walk me down the aisle when the time comes, and I think that will make it really special."
WATCH: Chandler Powell proposes to Bindi Irwin
Bindi - who met her fiance in 2013 while giving him a tour of Australia Zoo - revealed that her wedding dress will be inspired by the one the Duchess of Sussex, Meghan Markle wore in her royal wedding to Prince Harry.
"I mean everyone loves a beautiful love story but theirs is so extraordinary,” she told Hello of the royal.
“When you look at Meghan, just look at that beauty and the royals are always so graceful, and I think that grace is so fantastic."