In court documents filed earlier this month, the singer alleged that Belafonte was abusive - including physical assault, verbal threats and stalking - during their almost 10-year marriage.
The former girl band member and "America's Got Talent" judge recently filed for divorce from Belafonte, whom she married in 2007 and with whom she had one of her three children.
"She told friends she knocked them back and had tried her best to avoid being in their company from then onwards".
Mel B has yet to refute the claims.
Though Mel has accused Gilles and Belafonte of trying to extort her with sex tapes, the nanny insists she does not have any of them and when they did have sex, Mel would film the encounters and/or "take part in the menage a trois herself".
"Gilles was very embarrassed and confused on what to do, and did not want this sensitive information to be revealed to anyone", according to the lawsuit.
Meanwhile, Belafonte's lawyers have previously rubbished his ex-wife's accusations, describing them as "outrageous and unfounded".
"He forced her to 'participate in sexual intercourse with him and random women, '" the site reported, adding that Mel B claimed "he would often secretly record the encounters". "News" reports. Mel and Stephen have not responded to her claims.
In addition to the usual disagreements over children and property, the split has resulted in allegations of abuse, revelations about unusual bedroom shenanigans, and even extortion allegations centering around a sex tape starring Mel. The documents allege that Gilles was seduced in her teens and was thrown into a sexual relationship for almost a decade with the singer, and encounters that occasionally involved threesomes that included Melanie Brown's husband, Stephen Belafonte.
Is the child going to have access to computers while she's with Mr Belafonte?'
'Mother Teresa does not marry Atila the Hun, ' she said.
"Brown assisted Gilles with arranging the appointment, advanced the cash for the procedure, and booked a hotel for Gilles to stay in to recover from the procedure in privacy", the lawsuit reads.
But now in some shocking counter claims, Lorraine has filed court documents that allege Mel was the one who seduced her - and that she and Stephen only slept together with Mel's knowledge.
Belafonte's legal team has said he "vehemently" denies the allegations against him.