Jessica Mauboy has made her Eurovision debut for Australia, performing for an audience of about 125 million people worldwide.

The singer performed her song Sea of Flags in front of the Australian and Aboriginal flags during a break in Thursday night's second semi-final.

It is the first time in Eurovision history that a non-European country has been asked to perform.

But Mauboy is not the first Australian to grace the Eurovision stage. While Australians cannot compete in Europe's largest singing competition, three have competed for other nations.

Olivia Newton John was the first Australian Eurovision competitor, representing the United Kingdom in 1974.

Wearing a gold Australian-made gown, Mauboy's exuberant performance led to her trending on Twitter in the United Kingdom.

Now her part in the competition is over, Mauboy says she is rooting for popular contestant Conchita Wurst, an Austrian drag queen who has been tagged the competition's "bearded lady".

"Oh yes, I'm really good friends with Conchita," she said.

"What's so amazing about her, about Eurovision, is that it allows you to be the artist that you are and take a bit of a risk."

AAP