At the end of last month they reportedly settled their lengthy and ugly divorce battle acrimoniously for '£6.5million'.
But it appears the conflict isn't over, with reports claiming Stephen Belafonte has accused Mel B, both 42, of breaking their spousal agreement.
She in turn reportedly accused him of unreasonable behaviour, despite them coming to an agreement over spousal support and custody of their six-year-old daughter Madison.
According to TMZ, Stephen accused his ex wife of ten years of being late on her November spousal support payment, however Mel's lawyer reportedly argued that her business deals fell through at the last minute, but she's up-to-date on payments.
In turn Mel is said to be accusing him of unreasonable behaviour, claiming that he expects to turn up to their old family home without any advance notice.
According to the site, Mel feels Stephen is 'looking for any excuse' to continue their battle.
The outing comes after The Sun reported Mel is set to pay her film producer ex, a total of '£3million over three years' and will give Belafonte a sum of '£3.5million from the sale of the home they shared together'.
It's also believed the duo have come to an agreement over custody of their daughter Madison and have vowed to destroy any 'compromising videos' from their relationship.
A source had told the paper: 'Mel is giving him a lot less than people think.
'Should he ever break that deal, he would be on the line for millions,' they added.
It comes after Mel is believed to have paid out £500,000 in legal fees.
According to TMZ, Mel and Belafonte will share custody of their six-year-old daughter Madison and arrange a schedule for physical care between them, but neither will pay child support.
Custody of Madison and Belafonte’s application for step-father visitation of 10 year -old Angel - Mel B’s daughter by Eddie Murphy - are still to be settled.
Mel and Belafonte married in 2007 but the singer filed for divorce in March this year citing 'irreconcilable differences' and claimed domestic abuse.
Mel is also mother to daughter Phoenix, 18, with ex-husband Jimmy Gulzar, whilst Belafonte has daughter Giselle, 12, with ex Nicole Contreras.