Fans are left stunned by this one detail in Bindi Irwin's video of daughter Grace, two, as she wishes her mother a happy birthday

Bindi Irwin, Chandler Powell Celebrate 4th Engagement Anniversary: A Timeline of Their Wildlife Love Story

Steve Irwin's granddaughter Grace Warrior pays sweet tribute to mum Bindi Irwin at Australia Zoo on the wildlife warrior's 25th birthday

Robert and Bindi Irwin share heartbreaking video of their late father Steve describing his relationship with their mother Terri as 'love at first sight' as matriarch turns 59