Bindi Irwin shares heartfelt tribute to husband Chandler Powell as he celebrates 30th birthday - before delivering a cheeky reminder that she's his 'younger, hotter wife'

Bindi Irwin has shared a heartfelt message to her husband Chandler Powell to mark his 30th birthday on Saturday.

The celebrity conservationist, 28, posted a gallery of precious photos on social media of her and her American-born husband happily posing together at a wildlife park.

The pair beamed as they happily embraced and posed with their daughter Grace Warrior, five, amid breathtaking mountain scenery, with several cows also making an appearance in the background.

Bindi accompanied the sweet family snaps with a touching tribute to her husband, declaring that he and their daughter were her entire world.

'Happy 30th birthday, my love. Grace and I both agree; you're our world. And our home. We love you beyond description,' she wrote.

Chandler was quick to show his appreciation to Bindi in the comments section, writing: 'I love you so much. You girls make every decade wonderful.'

But it wasn't all romantic declarations, with Bindi also sharing a cheeky birthday joke at Chandler's expense.

In another photo taken at home, the birthday boy could be seen proudly holding up a card bearing the rather brutal message: 'Today we mourn the loss of a man to his 30s. He is survived by his younger, hotter wife.'

The tongue-in-cheek greeting was sure to give Chandler a laugh as he officially bid farewell to his twenties, with Bindi clearly delighted to remind him that she's still got the age advantage.

'Bring on the 30s club. This card perfectly sums it up. Thank goodness for my wife,' Chandler wrote.

The couple, who tied the knot in a private ceremony at Australia Zoo in March 2020, welcomed their daughter Grace in March 2021.

Bindi and Chandler first met in 2013 when the American athlete visited Australia Zoo while competing in a wakeboarding event.

After maintaining a long-distance relationship for several years, the couple became engaged in July 2019 before marrying in an intimate ceremony at Australia Zoo in March 2020, during the early days of the COVID-19 pandemic.

They welcomed their daughter in March 2021 and have frequently shared glimpses of their family life and conservation work together on social media.

Bindi and Chandler live with their daughter at the Australia Zoo sanctuary, where they are both heavily involved in operations.

She and her younger brother Robert, 22, have worked hard at continuing their father Steve Irwin's legacy, following his tragic death in September 2006.

The celebrity conservationist died when he was struck in the chest by a stingray while filming underwater at Batt Reef, off the coast of Queensland.