Kylie Minogue and her fiancé Joshua Sasse will not marry until same-sex marriage is legal in her native Australia.

Joshua Sasse and Kylie Minogue

Joshua Sasse and Kylie Minogue

The couple announced their engagement in February this year after five months of dating and the 28-year-old actor has now revealed the lovebirds will not tie the knot until gay and lesbian couples have the same rights as heterosexual couples Down Under.

Joshua says her and Kylie, 48, are keen to tie the knot in her hometown of Melbourne but not until the country has marriage equality.

Speaking to Australia's Network Seven, he said: "There are chances of a Melbourne wedding ... [but] we will not get married until this law has passed in Australia."

Both Joshua and Kylie - who has always had a huge gay fanbase -are supporting the Say I Do Down Under campaign which is calling for a law to be passed which will allow men to marry other men and women to wed women.

The 'Galavant' star - who launched the campaign with Kylie and Dolly Parton at the weekend - admits he was shocked when he discovered that same sex marriage was illegal in Australia.

He added: "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."

In September, Australian Prime Minister Malcolm Turnbull introduced legislation to allow a public, non-binding vote on same-sex marriage to take place in early 2017.

Joshua and Kylie are not the only celebrities calling for same-sex marriage to be legalised in Oz.

Margot Robbie - who is from Queensland - appeared on TV show 'Saturday Night Live' at the weekend wearing a T-shirt emblazoned with the slogan "Say 'I Do' Down Under", with a rainbow map of Australia.