On Wednesday, the Dancing With the Stars alum shared a throwback photo of her mom holding her as a baby, along with a sweet message. "Happy Birthday to the strongest and most beautiful woman I know," Bindi wrote. "Thank you for being my mother. You inspire me every day. I love you."
The feelings are certainly mutual between this mother-daughter duo. In October, Terri -- who was married to Crocodile Hunter star Steve Irwin for 14 years until he died in 2006 -- gushed to ET about Bindi and her son Robert.
When Bindi was competing on DWTS, she spoke to ET about how much she admires her mother. "No matter what has happened in life, her strength and her support has never once wavered," she said. "She is so kind. She is there every single day during rehearsal."
July is a month of celebrations for the Irwin family. On July 24, just four days after her mother's birthday, Bindi will be turning 18.