Sia just delivered one of the best Carpool Karaokes yet, as the Australian singer-songwriter stopped by James Corden's Late Late Show sketch to sing some of her own tunes, some music she's written for others, as well as explain why she believes in aliens.

The music is rock-solid: along with "Chandelier," "Alive" and "Elastic Heart," Sia helps Corden through Rihanna's "Diamonds" as well as her guest spot on David Guetta's "Titanium." However, the best part of this karaoke session is watching Sia's personality take flight, whether she's explaining her face-covering wigs, cradling a dozen eggs in her hands (!) or complimenting Corden's own multi-colored wig.

Also, the opening bit in which Sia pretends she can't see while walking on the sidewalk is pretty damn funny. How much can she see through that wig??

Sia's This Is Acting album was released last month, and has been accompanied by some stellar live performances. Click here to watch the best of the best.