She told me the secret after I was the only journalist to be given an XS All Areas pass when the world's biggest selling female singer arrived in town this week.
In our eXSclusive chat she revealed she can't wait to work with KIAN, NICKY, MARK and SHANE again. Mariah said: "They're very exciting artists and I love them."
She last worked with the lads in 2000, and Against All Odds topped the charts.
But this time the record will ONLY be released in Britain. "I want it to be the next single here and different to the rest of the world," she said. "I can't wait to do it."
Mariah, 39, was in London to switch on the Christmas lights at the Westfield Shopping Centre.

She invited me backstage for a chat, and I can tell you the 20 white kittens
and 100 white doves that she'd been rumoured to have demanded were nowhere
to be seen.
In fact, the diva's area was quite modest - she even had to use a portaloo while she signed autographs for hours (though it was a luxury one with pink walls and a heater).
"This diva tag is never going to go away but it doesn't bother me anymore," Mariah said. And setting the record straight she added: "I didn't ask for anything."
Mariah performs new single I Want To Know What Love Is on tonight's X Factor from new album Memoirs of an Imperfect Angel.
Hubby NICK CANNON joined her in London, but they're not ready to start a family yet. "Music is still my focus. But that's not to say one day... "
RONAN KEATING is planning a Boxing Day's knees-up with Boyzone to celebrate STEPHEN GATELY'S life.
At his Emerald and Ivy Ball in aid of Cancer Research last night he told me: "It's going to be hard at Christmas not having Steo around as we always saw each other. So we're having a little get together on Boxing Day.
"The only way we can get through this is being together and talking about Stephen."
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so sad about stephen, i'm still in shock but i'm glad his memory will live on in the other boys. sleep peacefully stephen will always live on in my heart.xx
By amanda.. Posted November 22 2009 at 1:12 PM.