The 12 year old's mum, Terri, reveals the Fabulous Baker Boys star has stepped up to help the family in the years since Irwin's 2006 death - and she's thrilled her daughter has someone like the movie star to look up to.
Father-of-five Bridges offered to be there for Bindi and her little brother Bob, seven, after Irwin was killed during a diving expedition - because he shared the Crocodile Hunter's love of conservation.
Bindi and Beau first became pals on the set of Free Willy 4: Escape from Pirate's Cove - and he has become a constant presence in the pre-teen's life.
Terri tells U.S. tabloid The Globe, "Beau is just wonderful and he has become such a great mentor to Bindi and such a great friend."
And Beau admits he's happy to help out - because Steve Irwin was such a great inspiration to his kids.
He explains, "When (son) Zeke was little, he used to dress up like Steve Irwin and chase lizards around in the backyard."
Bridges' son now works at the Irwin family's Australia Zoo.