The 38-year-old singer has one of the world's most enviable figures but her fellow 'X Factor' judge says she has had a bit of help in the breast department.
Outspoken Louis was taking part in comedy panel show 'Celebrity Juice', when he spoke about Nicole's cleavage.
An audience member told the Daily Mirror: ''The celebs were playing a game called 'What's The Craic' about different stars with secrets and someone made a comment about Nicole's boobs.
''Louis then blurted out, 'Yes, they're new boobs! She has new boobs!' Everyone gasped and there was an awkward silence afterwards. He didn't seem to be joking.''
In 2012, Nicole spoke out about her impressive boobs, saying she's never had any work done and instead relies on good bras.
She said: ''Everybody can have cleavage with the bras we have today. And I use those bras - absolutely. They can give you confidence!
''I haven't had cosmetic surgery. But maybe I would, in time. I'm not against it, if you want to enhance something or make yourself feel a little bit more confident. To each their own.
''First of all you have to accept yourself and love yourself from within. Everybody's talking about this Botox. I've never had it, but one day, you never know...
''Ageing doesn't bother me. I feel that, as a woman, some of your securities subside as you grow up. But it's up to you to take care of yourself, to love yourself from within and to make sure you grow older with grace.''
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