Australian singer Sia revealed her voice cracked when she performed her hit songs Chandelier and Titanium in front of big name stars.
The Adelaide-born singer described her performance at Jennifer Aniston and Justin Theroux's wedding in August as "laughable."
"I went for the Chandelier chorus and it was like, it was actually hilarious. It sounded like three weird squeaky notes at the same time were coming out, it ruined the entire chorus," Sia told Fitzy and Wippa.
She also revealed she couldn't hit the high notes in front of US President Barack Obama at the Democratic National Committee's LGBT Gala in 2014.
"I think I did three songs and I think the end was Titanium and I just couldn't even hit that high note by the end, it was hilarious," she said.