“I'm so thankful for today, as today was the day that you were born,” she captioned the photo.
“Without you there would be no me. without me there would be no River or child growing in my belly. Thinking happy thoughts of you today, reflecting on the good times and wishing you were still here with us. Happy Birthday Dad.”
Fans were quick to console Gale, who lost her father in 2014 after a battle with lung cancer.
The 41-year-old model announced she is expecting her second child with AFL star partner Shaun Hampson last month. The couple - who have been dating since 2011 - welcomed first child River into the world in 2014.