WATCH: James Corden's Ultimate Christmas Carpool Karaoke

Turns out James Corden is the festive version of that guy who secretly proposed to his unwitting?girlfriend over and over again for a year. But slightly less creepy. Turns out, that amongst the success of Corden's "Carpool Karaoke" segment on his?Late Late?show, he's been plotting the ultimate Christmas mash-up.

And how do all great Christmas videos begin you ask? With a healthy dose of Marish Carey's left boob of course!

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While filming scenes with the music royalty like Adele, Lady Gaga, Chris Martin, the Red Hot Chili Peppers, and Selena Gomez, among others, he's been getting them all to sing-along to Carey's Christmas hit?All I Want For Christmas Is You.

Our favourite bit has to be Chili's bass guitarist Flea as the most rock n' roll Santa ever. However, credit where credit is due - no one can out-Mariah Mariah. No matter how hard Demi Lovato tries.

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