Crikey, Robert Irwin and girlfriend Rorie Buckey just took a major step forward in their relationship—which has also won his sister Bindi Irwin's seal of approval!

The son of late Crocodile Hunter star Steve Irwin and the niece of late actor Heath Ledger have gone Instagram official. Robert, 19, shared his first pic with Rorie, also 19, on his grid Aug. 24. In the photo, a selfie, the two are seen standing on a sidewalk in front of a flowering tree and a park. Robert shared the post almost two months after he and Rorie went public with their blossoming romance by making their red carpet debut as a couple.