Watch: Sia Joins James Corden For 'Carpool Karaoke'

James Corden is back again belting out tunes with the secretive singer Sia.

The Australian superstar rode shotgun with Late Late Show host as part of the show's popular skit Carpool Karaoke.

"I don't wear this unless there's cameras around," Sia said about her trademark black and white wig. "I only wear this just to try and maintain a modicum of privacy."

The pair cruised around Los Angeles singing along to Sia's hits 'Chandelier,' 'Elastic Heart', 'Alive' and 'Titanium' and Rihanna's 'Diamonds'

She also opened up to the television presenter about her past battles with addiction. "I was a singer already for like 10 or 11 years, to mediocre success, and I was an alcoholic and a drug addict and I sobered up and decided I didn't want to be an artist anymore because I was starting to get a little bit famous and it was destabilizing in some way. So I thought, 'What doesn't exist in pop music at the moment?' And it was, mystery," she said.

Previous participants in the segment have included the boy band One Direction, Canadian singer Justin Bieber, superstar Adele and musical legend Stevie Wonder.

Watch Sia and James Corden singing up a storm below.