James Corden tries Sia's wig on for size in new 'Carpool Karaoke'

By Chloe Best

Just when you thought James Corden couldn't possibly top his current Carpool Karaoke roster, the Late, Late Show host raises the bar even more. On his most recent drive to work in Los Angeles, the comedian picked up none other than Sia herself.

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Wearing her trademark wig that shields the majority of her face, the Australian singer shows off her vocal prowess while singing some of her biggest hits and songs that she has written, including "Chandelier", "Elastic Heart" and Rihanna's 2012 single "Diamonds".

TAP TO VIEW FULL GALLERYJamesCorden-Sia explained why she wears her trademark wigs to shield her face

Sia also explains the reason why she shields her face with an array of weird and wonderful wigs, telling James she only wears them when there are cameras around.

"I only wear this just to try and maintain a modicum of privacy," she said. "I was a singer already for ten or 11 years to mediocre success. I was an alcoholic and drug addict and I sobered up and decided I didn't want to be an artist anymore because I started to get a little bit famous and I was destabilising in some way.

"So I decided what didn't exist in pop music at the moment? And the answer is, mystery."

JamesCorden1-The singer showed James her party trick

The pair's conversation took a light-hearted turn when James put on a similar black and blonde wig to Sia for the rest of their journey. As well as discussing their theories on whether or not aliens exist, Sia also showed James her impressive party trick – cradling a dozen eggs in her fingers.

The "Titanium" singer revealed that she has double jointed fingers and so can support six eggs on the top of each hand, but accidentally smashed one egg when it dropped onto the floor.

Sia follows in the footsteps of a number of high-profile stars to feature in the popular sketch, with Justin Bieber, Elton John, Chris Martin and Adele all hitching a ride with James in recent weeks.

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