WATCH: The 'All I Want For Christmas' Carpool Karaoke with Mariah Carey, Adele, Chris Martin, Elton John, Red Hot Chilli Peppers & loads more is the best yet 3 years ago

WATCH: The 'All I Want For Christmas' Carpool Karaoke with Mariah Carey, Adele, Chris Martin, Elton John, Red Hot Chilli Peppers & loads more is the best yet

Go on, we dare you not to sing along...

After years of research and extensive testing, scientists have concluded that Mariah Carey's perfectly poptastic 'All I Want For Christmas' is officially the Greatest Christmas Song Of All Time.

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Plus, it's in the Bible.*

Every time you hear the gentle plinkity plonk of those sparkling opening Christmassy chimes, you just can't help but get excited. Admit it, we're all this girl...

James Corden and his team at The Late Late Show With James Corden obviously know this and so they've spent all year asking loads of their Carpool Karaoke guests to take part in this excellent end-of-year special.

Love or hate Carpool Karaoke, you can't hep but be impressed as Mariah, Adele, Lady Gaga, Chris Martin, the Red Hot Chilli Peppers, Elton John and loads more stars sing their hearts out, just in time for Christmas.

Altogether now, "ahhhh ahh ahhhhhhhhhh don't want a lot for Chrisssaamahhhhhsssss..."

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Clip via The Late Late Show with James Corden

And here's the original for one more listen 97 more listens. Go on, you know you want to...

Clip via MariahCareyVEVO

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*Actually, we just made all that up, but we all know it's true, right?