Singer-songwriter Sia has slammed those responsible for leaking her recently penned track 'Beautiful People', which surfaced online yesterday (May 29).

The song found its way onto the Internet illegally and the leak infuriated the 'Wild Ones' songstress, who called it a 'waste of a day's work'. Writing on her official Twitter page this afternoon, she explained:

"Beautiful people is not david guetta, and it was merely a demo I wrote for a pop artist. It is now a waste of a day's work, as it's leaked!"

Although she confirmed that the cut was not a David Guetta collaboration, she has previously worked with the French dance star on a number of hit singles including 'Titanium' and 'She Wolf (Falling To Pieces)'.