The couple, who attended Chandler's brother Cameron's wedding a few weeks ago, were bombarded by adoring fans after they posted a loved-up picture at the nuptials to Instagram.
At the wedding, Bindi looked stunning in a floral dress, alongside her beau who donned a suave suit.
Bindi wrote in the caption: 'My love was best man at his brother's wedding a few weeks ago. Chandler was incredible. Handsome, attentive and so thoughtful.
'You shine every day but especially during this special moment in time. I'm always amazed by your strength and kindness.'
She continued, 'Your brother truly picked the perfect best man. Congratulations to Cameron & Kristin on their marriage and my sunshine for being an outstanding best man.'
Fans bombarded the image with demands for the couple to get married.
'WHEN ARE YOU GETTING MARRIED,' one eager fan wrote.
Another added, 'I can't wait to see you two walk down the aisle.'
'So when is your big day?' said another, with another loyal follower writing, 'Put a ring on that girls finger!! Perfect pair ❤️'
Chandler and Bindi met in 2013, when the American was visiting Australia Zoo with his family.