Mel B is reportedly furious that her Spice Girls co-member Victoria Beckham is taking part in James Corden's Carpool Karaoke for The Late Late Show.
According to Daily Mail the 41-year-old is fuming at her former bandmate, 42, for 'embracing' her girl band roots after many years of turning her back on the Spice Girls to help forge her career in the fashion industry.
After Victoria took to Instagram on Wednesday to give a sneak peek into her appearance on the show, it was claimed that anger erupted hot on the heels of Mel's apparent dismay at Victoria's use of Spice Girl hits in her Target advert.
Victoria delighted fans on Wednesday, as she gave a backstage peek into the Carpool shoot in which she showed her hairdresser Ken Paves giving her a glamorous do before hopping in the Range Rover with her fellow Brit abroad.
In the midst of much hysteria from fans, it has been claimed that Mel was enraged at the decision due to Victoria's reluctance to be involved in any part of Gem - the reunion group formed by Mel B alongside Emma Bunton and Geri Halliwell.
Last year, Victoria seemed to cast aspersions on the reunion, when she said to Claudia Winkleman: 'I think they should sing their own material though, because what we did was so special. If they sang Spice Girls I think I might be a bit sad.'
It seems these comments have caused anger as sources stated Mel, who is currently going through a tough divorce from husband Stephen Belafonte, is unhappy with Victoria's behaviour.
The insider stated: 'Mel is livid Victoria is all of a sudden embracing her Spice Girls past after years of trying to distance herself from the band. She was desperate for the girls to go on a very lucrative reunion tour to celebrate their music with millions of fans."
'But once Posh pulled out, the idea began to crumble leaving the members of the band keen to perform having no choice but to ditch it. Mel feels it's unfair Victoria is now using their music to boost her own profile.'
MailOnline has contacted representatives for Mel B and Victoria for comment.
The publication also reported that Mel believes it to be 'unfair' that Victoria has used 1997 hit Spice Up Your Life for the advert for her forthcoming clothing range with US store Target, which features 200 for women, girls, toddlers and babies and range from $6 to $70.
Victoria joins a bevy of A-listers in scooping a seat in the world famous skit from the US show, on which James nabbed the host role in 2014, where he has been joined by superstars including Justin Bieber, Adele and Elton John.
While the funnyman has sang alongside some of the greats in his car, it is Victoria who boasts a catalogue of hits where she was one-fifth of one of the world's most successful girl groups.
Having later gone on to release solo music, she switched her focus to fashion full time in 2008, where she has built a fashion empire which has seen her become the go-to girl for celebrities working the red carpet.
Despite remaining quiet on the vocal front, Wednesday saw the star hint that she will be treating fans once more to her stellar singing on the American chat show.
On her Instagram story, Victoria, who was nicknamed Posh Spice, initially showed herself being primped and preened by Ken in which she claimed she was filming 'a secret project'.
She seemed to change her mind shortly after however as she shot scenes from within a car while saying: 'So we are here about to film Carpool Karaoke.'
The stunning star then turned her camera on her famous co-star as he climbed into the driving seat while she introduced him, saying: 'Here's James!'
With the huge popularity of the group, fans will undoubtedly be delighted ahead of her debut on the show aside from Mel's chagrin, yet Victoria's singing skills were often panned throughout her solo career and time in the band.