Bindi Irwin shares a sweet photo with her 14-year-old brother. They look so grown up

The close siblings expressed their love for each other in separate tributes they shared on social media on National Sibling's Day.

They lost their father Steve Irwin at a very young age and Bindi and Robert Irwin celebrated their closeness on National Sibling’s Day by posting tributes to each other on their Instagram.

In her version, Bindi expressed how “blessed” she was to have her 14-year-old brother by her side as she shared a photo of the two of them in the midst of a beautiful mountain landscape. Her touching note spoke of how deeply she felt about him.

“Just a little note to thank you for being such an awesome brother. It has been wonderful to watch you achieve such extraordinary things in life.

“I'm so proud of the amazing person you are and I'm truly blessed to be your sister. @robertirwinphotography #NationalSiblingDay.”

Robert was equally grateful to his sister he considers his “best friend” as he shared the same photo and wrote,

“Happy #NationalSiblingDay everyone! I am so thankful to have the most amazing sister in the world! You are not just my sister, you’re my best friend.”

Just days before they mutually affirmed their affection for each other, the siblings along with their mother Terri Irwin met with His Royal Highness Prince Charles who was visiting Australia for the 2018 Commonwealth Games.

Bindi shared a souvenir photo of their memorable acquaintance with the British royal in Lady Elliot Island and shared with her followers the reason for their association.

“Our family feels extremely privileged to have had the opportunity to meet with His Royal Highness The Prince of Wales and other dignitaries today at Lady Elliot Island. We joined together to discuss important methods to protect the largest living structure on Earth, the Great Barrier Reef. We must work together to make a difference and protect these sensitive ecosystems for the generations to come.”

Robert likewise expressed how “truly honored” he was to meet Prince Charles who was also joined by his wife Camilla, the Duchess of Cornwall on his seventh visit to Queensland.

The 69-year-old Prince has been promoting eco-tourism for quite some time now and he spoke to other wildlife enthusiasts at Lady Elliot Island Eco Resort to plan for the safeguarding of the reef. The conference was also attended by some of the top companies in Australia who are also devoted to preserve the Great Barrier Reef.

Among the places the royal couple visited in Queensland during their recent royal tour were the Botanic Gardens, Lady Cliento Children’s Hospital and the Bundaberg Rum Distillery.