Kylie, 48, and Joshua, 28, announced their engagement in forthcoming marriages section of The Telegraph in February, and are now campaigning for same-sex marriage to be legalised in Australia.
Joshua and Kylie started dating in September 2015, and got engaged at Christmas of the same year
'There are chances of a Melbourne wedding ... [but] we will not get married until this law has passed in Australia,' Joshua explained to Network Seven, an Australian TV network, this week.
'When I found out that gay marriage was illegal in Australia, I was astounded.'
'I simply can't fathom on any level, whether it’s moral or religious or anything, that I have the right to get married and to marry the person that I love and that somebody else doesn't because of their sexual orientation.'
Joshua launched his 'Say I Do Down Under' campaign at the weekend, and the Instagram account for the movement explains:
'This is the new campaign to raise awareness and support for the #LGBT community in Australia so they can have the right to marry the ones THEY love too!'
Australian prime minister last month introduced legislation to allow a non-binding vote on same-sex marriage early next year, but critics say that it is a waste of money, as the final decision will still ultimately lie with parliament.
Speaking on TV show Sunrise on the same day as his Network Seven interview, Joshua added, 'Why are we anymore important than anybody else? It's not right, something has to be done about it.'
'I wanted to tell you today on her behalf and our behalf that until this law has passed in Australia, we will not be getting married.'