Shortly after the interview, it was claimed 'Scary Spice' made a panicked phone call to Geri to apologise
It is alleged that the racy confession will anger Geri's husband Christian Horner as she has 'worked hard to reinvent herself as a perfect Stepford wife'
The Spice World - 2019 tour kicks off on May 24 in Dublin with dates in Cardiff, Manchester, Coventry, Sunderland, Edinburgh, Bristol and London.
'She (Geri) is going to hate me for this because she is all posh in her country house and her husband, but it's a fact. It just happened and we just giggled at it and that was it. She had great boobs.'
The openly bisexual singer, 43, made the shock admission while filming for Piers Morgan's Life Stories on Friday, cheekily telling the broadcaster Geri had 'great boobs' and adding: 'It just happened and we just giggled at it and that was it.'
However, the saucy details of their night of passion has already reportedly caused great upset, with sources revealing Mel made a frantic call to Geri amid claims the confession upset her husband Christian Horner.
Piers delightedly expressed: 'This is a bombshell. A Spice Girls bombshell. You have never admitted this before have you? People are going to be fascinated!'
Mel responded: 'Yeah and I have said it now. All done. She is going to kill me and so is her husband.
'Hopefully when Geri gets asked that, which hopefully she will after this, she won't deny it, because it was just a thing, a fun thing,' she stated.
Meanwhile, her bandmate Melanie Chisholm – Mel C – who was in the audience looked shell shocked by the revelation, admitting: 'This is all new to me.’
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A source then revealed to the English tabloid Sun more details on the night of passion between the two Spices, which dates back to when the girls of the group had moved together in a house in Maidenhead, Berkshire. “It was the mid-nineties and at that time Mel B and Geri were inseparable. Their extravagant personality tied them together. Then it often happened that the two took and left alone on vacation without the rest of the band, "writes Sun.
Brown, 43, said the pair slept together during the group's heyday and "giggled" about it after.
She said Horner, 46, would "kill her" for revealing the reported encounter, according to The Sun.
