She has also accused the producer of hurting her after he flew into a fit of rage out of "jealousy" when she filmed a segment with Usher, which he saw as "flirting", for The X Factor in 2012.
Things allegedly took another turn for the worse just before the Spice Girls performed at the Olympic closing ceremony in London in 2012 as he pushed her so hard that she suffered carpet burns.
Mel has claimed her estranged husband forced her to tweet that she had "injured herself by running in heels" in a bid to stop people speculating when she took to the stage in front of the whole world.
The singer - who has five-year-old daughter Madison with Belafonte - has stated she became so "overcome with emotional and physical exhaustion" in 2014 that she overdosed on a bottle of Aspirin.
However, she's claimed she never reported the attempted overdose to the emergency services because Belafonte allegedly locked her in the bedroom and told her to "die, bitch."
But Mel has admitted she wasn't just subject to physical and emotional abuse but Stephen also allegedly got their nanny pregnant and suggested "all three of us" live together with the new baby.
However, the nanny was later paid a reported US$300,000 to have an abortion, the documents claim.
It was previously claimed that the estranged couple had an "open and loose relationship" but Mel states that Belafonte actually forced her to have "intercourse with him and random women".
He then secretly filmed the steamy trysts and allegedly threatened to release the sex tapes.
Mel has claimed she had previously tried to leave Belafonte but he "threatened me with violence and threatened to destroy my life in every possible way ... destroy my career and take my kids from me."
Belafonte has denied all the allegations against him and says he has been left "distraught" by her claims.
He told TMZ: "I haven't heard these allegations. You know what my comment on this is, as this is the mother of my children? I'm really really distraught in my brain by how this is going to affect our children and the depths that she's gone to. I'm shocked at those allegations and that's what it is. I think someone's set me up to look like a bad guy.
"Obviously you saw my house got raided and nobody found anything. It's accusation after accusation. But we'll have our day in court. And we have children. If anyone knows our children, we have beautiful children. They're on social media. Why do this? We were friends two weeks ago. And now all of a sudden the team gets around and now it's got to be this."
As well as Madison with Belafonte, Mel also has Phoenix, 18, with her first husband Jimmy Gulzar and nine-year-old daughter Angel with Eddie Murphy.
- Bang! Showbiz
