Robert Irwin has just turned 16 years old and every day it seems like he gets more and more like his famous father.
To mark Robert's special occasion, Terri wrote a heartfelt message on her Twitter along with a previously unseen image of Steve with Robert as a newborn.
"Happy 16th birthday, Robert Irwin. Your dad would be so proud of you. He has loved you since the moment you were born." she wrote.
Robert's older sister Bindi also shared a birthday message to her brother online...
"One of the sweetest photos ever taken My whole world. It’s incredible that Robert is sixteen now, time sure does fly."