This week the much-hyped Spice Girls reunion tour was plunged into jeopardy when Mel B revealed that she and Geri Horner had a secret lesbian fling at the height of the band's fame.
Mel immediately admitted that married mum-of-two Geri would 'hate' her for the revelation, but it's by no means the first time the two have come to blows.
Outspoken Mel previously told how the all five band members 'fought like cats and dogs' during their time in the spotlight - but it was Geri with whom things got really personal.
We take a look back at their twenty year long feud.
Geri's departure from the band
In the band's 90s heyday, rumours of infighting between Mel, Geri and bandmates Victoria, Emma and Mel C were rife.
Less than two years after their debut single Wannabe hit the top spot, Geri announced she'd had enough and confirmed her departure from the group in May 1998.
Her decision to leave at the peak of the band's fame and right before a huge US tour was never going to be well received, but her decision to quit on Mel's birthday really touched a nerve.
"When Geri left the group, it was bad," Mel said of their relationship in a TV interview.
"She left on my birthday and didn't tell anybody. She didn't show up. We had the American part of the tour to continue."
Clashes on the reunion tour
The band's first attempt at a reunion in 2007 brought up problems before the girls had even picked up a microphone.
As the fivesome got together for a London press conference to announce news of their tour, it was decided they'd all step out matching in head to toe black.
As well as looking striking and dramatic the styling would also demonstrate how united they were as grown women, with them being used to dressing very differently from each other, in keeping with their Spice characters.
But on the day, Mel B could not resist rebelling, adding a shiny, bright red skirt to her outfit, thereby flouting the all back agreement and meaning that that all eyes would be on her.
Spice Girl's tour announcement reheats decade old row about Geri Horner's dress
But, as Mel has learned so many times before and since, Never Underestimate The Halliwell – particularly when it comes to attention seeking.
Geri rocked up in a ultra feminine white flowing maxi dress adorned with flowers. She totally stole the show and had to be plonked centre stage in all of all the photographs.
Despite the rather awkward start to proceedings, all five Spices - including Victoria - went ahead with the tour - performing in America and the UK before the dates were sensationally cut short in February 2008.
Spice Girls' most outrageous tour moments uncovered: 'I was sick in her mouth!'
They cancelled gigs in Sydney, Beijing, Cape Town and Buenos Aires.
At the time the girls blamed "family and personal commitments" for the sudden change of plan.
But it's thought that even before the shows started the infighting of days past made an ugly appearance.
"I wasn’t in a very good space with my marriage and I didn’t feel I could go on any more, living in this fake world," Mel B said last year.
She even took full responsibility, saying: "It was my fault, so I was determined to get us back together and I’m still determined it will be five at one point."
When asked in a recent radio interview how long their 2019 tour was expected to be, Geri responded with a barbed jibe at her bandmate.
"Let’s see if Mel B behaves herself and then we’ll see," she warned.
Yikes.
Creative differences reopen old wounds
According to sources, Mel B and Geri are already bickering about the creative direction of the 2019 tour.
Mel is apparently wanting to re-market herself as an edgy and raunchy Rita Ora-esque performer, while Geri is hoping their latest get together will have a wholesome, family vibe reflecting how they've grown as mothers.
An insider told The Sun: "The gigs will go ahead whatever happens, but those two couldn’t be more divided and both see themselves as the boss. Everyone involved is braced for some epic arguments once they’re back together.”
While another source close to the group has claimed that married mother-of-two Geri was not happy with the costumes Mel is gunning for - deeming them 'too tarty.'
Geri is reportedly wanting to move on from her Ginger Spice alterego and has insisted Mel should 'grow up' and 'learn to keep her mouth shut occasionally," it's been reported.
Lesbian Sex allegations
The awkward start of the 2007 reunion tour pales in comparison to the bombshell Mel B unleashed this weeks just before the start of their comeback tour.
Just months ahead of their first night in Dublin on May 24, Mel appeared on Piers Morgan's Life Stories ITV show where she gave thedelighted host one hell of an exclusive.
Mel told that she and Geri once enjoyed a night of passion in their Spice Girls heyday - which they 'giggled' about afterwards.
Mel B's secret lesbian lovers revealed after Geri Horner sex bombshell
A grinning Mel admitted to a lesbian romp - before squirming that Geri and her husband Christian Horner were going to 'kill her' now.
"She is going to hate me for this because she is all posh in a country house but it wasn’t a ‘thing’, it just happened, we just giggled at it and that was it.
"We were best friends. It just happened."
Piers then revealed on Good Morning Britain how after the cameras stopped rolling Mel rushed off to phone her former rival to warn her about what she'd let slip.
Here's hoping they can hold it together before May 24!
