The most important ARIA Awards acceptance speech came from someone who wasn't nominated.

Sia wasn’t present at Wednesday night’s ARIA Awards, but she still managed to send a powerful message to everyone watching.

The Aussie singer scooped up a shiny, pointy gong for Best Female Artist, which was accepted on her behalf by Marriage Equality Australia ambassador Angie Greene — a move that was met with extended applause from the audience.

“This award is for every single non-hetero and gender diverse person who can currently not marry the person that they love in this country,” Greene began her speech.

Speaking through tears, she implored viewers to take a stand for the LGBTI people in their lives.

“This award is for our friends, our family, our work friends, all our mates. Bottom line is, Australia, that noone’s lives and the people that they love should be up for debate. You have the opportunity now to not just do a great thing, but to do the right thing,” Greene stated.

“On behalf of [Marriage Equality Australia], I cannot thank Sia enough. You are an absolute boss. And thank you so much for using this platform to send such a powerful and important and crucial message.”

Sia wasn’t the only artist who used the ARIAs as a platform to advocate for Australia’s LGBTI community.

Shortly after Greene’s speech, Kylie Minogue and Jonathan Sasse took to the stage to present an award, both wearing Sasse’s ‘Say I Do Down Under’ T-shirts.

“This is more than just a movement; this is people’s lives. And we just want to say to every single member of the LGBT community, you are not alone,” Sasse told the audience.

“You have a voice, and if we all stand together, we can bring Australia back on the right side of history and malke 2017 the year that we all say ‘I do’ Down Under.”

Troye Sivan also dedicated his Song of the Year award, which he won for the track Youth, to “every LGBT kid” in Australia.

“This is for every gay Australian kid who wants to make music… you can totally do it and win an ARIA too,” the 21-year-old concluded his acceptance speech.

According to The Sydney Morning Herald, Sivan also told reporters backstage that he planned to continue using his profile to fight for what matters — including marriage equality.

“I’ve been so blessed to have such an amazing platform to talk to so many people and I’m going use it every single second to talk about the things that I think are really important, and fight for the causes that I think are important,” he said.

We can’t wait to see more Aussie stars take up the fight.