Here's what we have learned watching Carpool Karaoke

There are reports that James Corden's Carpool Karaoke is going to become a show in its own right.

It started as a segment on The Late Late Show on CBS. Over here, it's been more of a viral thing on YouTube and it has almost 4 million subscribers.

Apparently James Corden and his team are trying to sell the show to TV networks.

He's not expected to host it, but will be involved as executive producer.

The idea has been a massive success. Adele got a lift in James's car in January. That's now been viewed more than 84 MILLION TIMES.

And along the way, we've picked up some gems of information.

James Corden can really sing

They shouldn't be surprised by this. You would imagine that they have seen at least one other episode before they do Carpool Karaoke.

But almost every time, there comes a moment when the celebrity realises that James Corden can harmonise with them and generally not mangle their music.

And then they do a shocked face. Like this.

Adele is the female Phil Collins

Adele and James take a drive through rainy London and basically giggle their way around.

She tells James "that's me playing the drums" on Hello.

James does a double take but the moment is cut short when she spills tea on her new coat. And then downs the rest of it. As you do.

Watch Adele doing Carpool Karaoke.

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But most of all, forget the ballads. That girl can rap. It's about 10 and a half minutes into the video.

Chris Martin wants to punch an elephant*

*not really

The pair stop to buy homemade lemonade from some kids and the sugar sends them slightly hyper.

Chris starts whooping and says "I want to punch an elephant".

We don't think he's serious.

He also treats us to his Mick Jagger impression and seems genuinely tickled when James sings the wrong lyrics.

Niall Horan wants to sleep with Tina Fey

Niall bagsies the front seat when One Direction take their ride.

So he gets to play a game picking who he would sleep with, marry or go with on a cruise.

Niall instantly goes for Tina Fey in the bedroom. He decides to marry Selena Gomez and take Demi Lovato on the cruise.

The group also puts on matching outfits for a sitting down dance routine "specially" choreographed by James. So bad it's good.

Justin Bieber doesn't wash his pants. Ever

Don't worry, he doesn't wear grubby knickers.

He says it's after he did an underwear advert. Apparently he gets sent "boxes and boxes".

So he just chucks them out after wearing them.

He says: "I definitely don't wear them twice. There are so many."

James also asks the highly important question: does he listen to his own music when he makes love?

It's a no.

Jennifer Hudson's fiance likes to 'play rough'

It turns out her other half is a Harvard law graduate. And a wrestler.

She explains: "Sometimes he likes to experiment on me and put me in a headlock."

"We call that domestic abuse in Britain," is James's dubious joke reply.

Other important things to note: She does some of the best emoting-into-a-water-bottle that we have ever seen.

And she goes to a drive-thru and sings through her order.

Never have the words "Girl give me a cheese burger. Yes! Cheeeese-burger" sounded so good.

Iggy Azalea looks like a Disney princess in a wedding dress

The pair chat about Iggy's wedding plans.

Demi Lovato is going to be a bridesmaid. The bride will not have her cleavage out.

And then they stop off for a bit of impromptu wedding dress shopping. The brief is classy but sexy.

Iggy pulls it off. James doesn't.

James Corden CANNOT believe his luck

He started out on Gavin and Stacey. But somehow he has this amazing job where he gets to hang out and be silly with some of the biggest stars on earth.

Every now and then he gets this look, as if he's realising that he has won the life lottery.

The best example of this was when Stevie Wonder phoned his wife up and serenaded her.

He sang to her: "I just called to say James loves you."

His face goes from shock to delight and then he wipes away tears.

Lucky git.

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