Geri is the latest guest judge on the show this evening and after a disagreement with Gary over an act singing 'Stop' by the Spice Girls, Geri claims that not all members of Gary's band Take That can sing.
Following the girl group's performance, Geri claims they have potential, however Gary doesn't agree telling the group: "There's barely a voice amongst you actually."
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An angered Geri then interrupts Gary, claiming that the same could be said for his group Take That.
She states: "Not everybody in Take That could sing, sorry, I'm just being honest."
Louis Walsh however comes to Gary's defence telling the feisty Spice girl: "Hey Geri, not everybody in The Spice Girls could sing."
Ignoring Louis (as most people do these days) Geri turned back to Gary saying: "Gary, when I first started I could not sing, I can sing now. Two of your members could not sing."
This light hearted rivalry between the 90's icons continues throughout the show this evening with Geri claiming: "I know that I'm competitive but he hides it, I'm just more honest about it. I think he's intimidated because you know, I sold more records."
And Gary doesn't exactly take the high road either telling judge Louis Walsh that the Spice Girls had essentially copied Take That.
He claims: "No it wasn't rivalry because we made the blueprint and then they copied it."
Watch Geri and Gary's catfight on tonight's X Factor at 8.10pm, ITV1.