Brown said the quartet would begin recording a new album next week only for Chisholm to dismiss the idea and say her band mate was "fibbing".
The Spice Girls will first perform on June 1 at the Etihad Stadium in Manchester, before heading to the Coventry Ricoh Arena on June 3 and Sunderland Stadium Of Light on June 5.
Members of the supergroup Spice Girls are reuniting for stadium tour in 2019 but without Victoria Beckham.
And on BBC Radio 2 earlier, she also said "No, it's not!" when Chris Evans said the group's Wembley Stadium gig on 15 June would be their last show. "It's just the four of us that are fully confirmed, but you know, Vic might join us at some point", she told Britain's ITV. "And now I'm gonna go because I'm gonna cry.' And she ran off and actually it was so quick, I didn't realise until I was halfway down the stairs and someone went 'that's Adele".
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And according to TMZ, if the gigs prove popular enough when tickets go on sale at the weekend, more dates will be added outside the United Kingdom and the quartet will earn around $6.5 million each.
Speaking on Heart, she admitted it had been "tough" going ahead without Beckham, who said she would not take part due to "business commitments".
"There were times.I wasn't sure, and we really support each other and the decisions that we make and we really support her and she's really supporting us". It's about supporting each other - not just when it's easy, but when it's hard.
"She's joining us at Wembley", chipped in Mel B, apparently in jest.
He gushed: "We also have an extra special Spice Girls surprise because I can now reveal that tomorrow morning on Heart Breakfast, the Spice Girls will be here!" While Horner said she didn't think they would, Emma Bunton teased 'That would be quite nice wouldn't it!' All five returned for a reunion tour in 2007 and a performance at the closing ceremony of the London 2012 Olympics.