The post showed a photo of the loved-up couple were enjoying a sunny day on board a boat.
Chezzi wore a floral swimsuit and black sunhat, while the pair both smiled at the camera.
Fans congratulated the pair on reaching their relationship milestone.
"Oh stop it!! Love bird’s Cheers you spunky couple," one follower commented.
"Beautiful couple," said another.
Chezzi and Grant are each other’s greatest supporters.
Together they’ve ridden through the highest of highs and kept on punching through the lowest of lows.
They married in 2010 in Hamilton Island, and went on to have two daughters, Sailor and Scout.
When the couple celebrated their eight year anniversary, Chezzi said: "8 years ago today, we both said I do. I never could have imagined that life or love could be this good. I love you more and more every single day.
"Two beautiful, gorgeous little girls, that look and act like parts of both of us perfectly blended. A dream come true!"
After winning the Gold Logie in 2017, Grant thanked Chezzi for pulling him through.
"To my beautiful wife, Chezzi. Oh my God, we did it, darlin'. We did it! We b****y did it. We are an incredible team and I want you to share in this."