Joshua Sasse announced earlier this week that he would not be walking down the aisle with fiancée Kylie Minogue until Australia legalises same sex marriage.

And the actor's Say I Do Down Under campaign has already gone global, in just a matter of days.

The latest celebrity to show their support for the cause is Ellen DeGeneres, who has made the campaign's logo an emoji in her app.

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Showing her support: Ellen DeGeneres has rallied behind the Say I Do Down Under campaign for same sex marriage equality in Australia

The 58-year-old took to social media on Friday to share the logo, which is a drawing of the map of Australia in rainbow colours.

'I love this so much, I made it an emoji. @SayIDoDownUnder #SayIDoDownUnder (sic),' the talk show legend shared to her 35.3million Instagram followers and 62.6million fans on Twitter.

The campaign was launched this week by Joshua, 28, to help 'Australians 4 Equality, a coalition of organisations working to deliver a winning campaign so we can legalise all love in this country.'

'I love this so much': The 58-year-old talk show host shared the campaign's colourful logo to her 35.3million Instagram followers on Friday

Spreading the word: Ellen's message was also shared to her 62.2 million followers on Twitter

Fighting for change: The global campaign was founded by Kylie Minogue's actor beau Joshua Sasse

It comes after the British hunk revealed he was 'shocked' when he found out same sex marriage wasn't already legal here at home.

Appearing on Sunrise on Thursday, Joshua announced: '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.'

He also said: 'Why are we anymore important than anybody else? It's not right, something has to be done about it.'

Gaining traction: The TV legend's support didn't go unnoticed by those manning the campaign's Twitter account

Love is love: Kylie has also shown her huge support for the campaign by wearing its T-shirt in her Instagram post on Friday

His fiancée was seen donning the T-shirt with the campaign's logo on Instagram on the same day.

'Feel the #love #lovers Love makes the world go round!! (sic)' the 48-year-old shared to her 1.4million followers.

And the campaign has also attracted the attention of fellow blonde superstar Margot Robbie.

Support: Margot Robbie showed her support for same-sex marriage by sporting a 'Say I Do Down Under' T-shirt on Saturday Night Live over the weekend

Support: Margot Robbie showed her support by sporting a 'Say I Do Down Under' T-shirt on Saturday Night Live over the weekend

The Suicide Squad actress wore the T-shirt as she took to the stage to host Saturday Night Live over the weekend.

Joshua and Kylie were rumoured to be tying the knot in the singer's native Melbourne later this year, but the date will now be dependent on the government's actions.

The pair met last year when the Spinning Around hitmaker guest starred on her beau's TV drama Galavant.

They announced their engagement in an official post in the UK's Daily Telegraph in February.