Miley Cyrus Turns 'Carpool Karaoke' Into a Confessional: Weed, VMAs and a 'Voice' Hit-and-Run

When the 24-year-old pop star wasn't belting out some of her biggest hits -- including "Party in the USA," "We Can't Stop," "The Climb," "Wrecking Ball" and "Malibu" -- she was busy talking to the "Late Late Show" host about her life, starting with how bad of a driver she is.

"I'm a f-cking terrible driver. All of the wrecks I've ever had have pretty much been in my own driveway, because I can't even get out of the driveway without having any," she said, then detailed a "hit-and-run" on the set of NBC's "The Voice."

She also used the popular late-night TV segment as a platform to explain how her infamous 2013 MTV VMAs performance with Robin Thicke led her to activism.

"I realized if that many people were going to talk about something that I did, or something that I do, then I should make it a good thing," Cyrus said. "And I should make it something that can change people's lives rather than be a controversial conversation that does nothing but become a fun Halloween costume for people."

Corden then asked Cyrus how high she was during that performance, to which she replied, "Actually zero."

"I can't smoke before I go on stage, I get too scared," she said. "That's just me. That's how insane I am. That's just normal."

But she was super high while filming her naked "Wrecking Ball" video.

"10," she told Corden.

Enjoy Cyrus singing "Wrecking Ball" completely sober below.