Taking to Instagram, Griggs congratulated her youngest son Joe and his partner Katie as they welcomed their first baby over the weekend.
The House Rules and Better Homes & Gardens host shared a gorgeous gallery of family pictures straight from the delivery room.
"Meet our gorgeous grandson... he is beyond exquisite.... 3.7kg and 54cm’s Long," the 44-year-old grandmother began.
"Katie and Joe completely calm and over the moon. Both families ecstatic with the safe arrival of this much loved little man. Yet to be named.... and beyond surreal. Can’t begin to describe how incredible it is to see my baby holding his baby. What a beautiful day..:)."
Griggs also shared a snap alongside her partner, Todd Huggins as the two embraced the new addition to their family.