"Tonight we were honoured to meet the man again at the screening of his movie Dan Carter: A Perfect 10.
"What a man. What a movie. It's got Fathers Day written all over it! Get there!"
One of Gunn's followers asked his thoughts on the film and his reply was full of praise for the project, which was directed by Luke Mellows.
"I really enjoyed it mate," wrote Gunn. "He's a very humble fella who tells an extraordinary story. They have managed to capture some great bits and his Dad in particular is something special! Go see it mate!"
Carter has since given his approval by liking Gunn's post of the two photos.
Dan Carter: A Perfect 10 opens in cinemas nationwide from tomorrow.