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The Late Late Show With James Corden treated fans to the the majority of epic edition of "Carpool Karaoke" yet on Wednesday night once surprise guests George Clooney and Julia Roberts joined Corden and Gwen Stefani for the joyride. Now, ET has actually details on exactly how the star-studded grouping came about.

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Wednesday"s segment began out well enough through Stefani as the formerly announced guest. The No Doubt frontwoguy and the talk show host were having actually a pleasant drive via Los Angeles, singing some of Stefani"s classic tunes, when they hit a snag. Corden feigned frustration at coming up on a area of the "carpool" lane that supposedly forced four passengers per automobile.


WATCH: George Clooney and Julia Roberts Crash Gwen Stefani"s "Carpool Karaoke"

Luckily, Corden had the ability to call on Clooney, and also in turn, Clooney had the ability to get in touch with Roberts to meet the four-passenger need and also at the same time take "Carpool Karaoke" to one more level.


ET"s Nischelle Turner spoke to Late Late Show producers Rob Crabbe and Ben Winston, that defined that booking the two Osvehicle winners was more an instance of "stars aligning" than a plan to gain them all on the very same schedule.


"I think it was Julia who got to out," Crabbe explained. "She discussed she"d love to do "Carpool Karaoke" if we were ever before going to execute one through someone like Gwen Stefani ... and also we happened to be doing one with Gwen Stefani in the next 2 days."

WATCH: James Corden Reveals His Dream Carpool Karaoke Guests

Winston included that while Roberts and Stefani aren"t close friends, Roberts is a huge fan of the GRAMMY winner"s work.

"She turned as much as the carpool wearing a Gwen Stefani shirt!" Winston sassist. "What was lovely is that they"re all expensive fans of each various other. George was a enormous fan of Gwen. Gwen was a substantial fan of those 2, and also obviously every one of them, luckily, were significant fans of "Carpool Karaoke.""


The segment was shot on Wednesday, April 13, which supposed they had to save a lid on the surprise for three weeks. So just how did they store their key safe?

WATCH: Adele Perfectly Nails Nicki Minaj Rap on the Most Incredible "Carpool Karaoke" Ever

In order to shield the stars from paparazzi lenses, Corden and Stefani picked up Clooney and Roberts at the Los Angeles studio where The Late Late Show tapes. Crabbe added that tint on the ago windows assisted keep the stars out of see of prying eyes.

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Check out the video listed below to watch the quartet in activity.


George Clooney and also Julia Roberts Crash Gwen Stefani's 'Carpool Karoke' -- and It's Epic!


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