Terri Irwin has shared a touching message with her now teenage son Robert Irwin as he celebrates his 13th birthday.
The mum-of-two took to Twitter to wish Robert a happy birthday saying her late husband Steve lives on in him.
Bindi Irwin also took to Instagram, saying she was so proud of her brother.
Bindi's American boyfriend Chandler Powell, who is a professional wakeboarder, also wished the youngest Irwin a happy birthday, showing the pair clearly get along.
Robert, who is a keen photographer made his debut on Instagram saying he was excited to be celebrating his birthday, the start of his teen years.