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.
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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.