Ray J is threatening to take Kris Jenner to court for denying she was behind the leak of Kim Kardashian's infamous 2002 sex tape.
The 41-year-old singer, real name Ray Norwood, previously accused Kris of "masterminding" the ordeal that launched Kim's stratospheric rise to fame.
But this week the business mogul, 66, took part in a lie detector test while appearing on The Late Late Show with James Corden with her daughter Kylie Jenner.
And now Ray J has lashed out at his ex-girlfriend and her mother - warning Kris she has "f***ed with the wrong person" as he accused the polygraph examiner, John Grogan, of being a "fraud".
"You f–ked with the wrong black man krisjenner @kimkardashian — i dont give a f**k how old this s**t is!!" he wrote on Instagram.
"What you trying to do to me is almost inhumane and foul at the highest level— f**k this being just racist — this is wrong to do to anybody— you think you. can just f**k people over and get away with it forever!!!”
He then called her "devils and con-artist" and accused Kris of "trying to bury me".
He then took aim at the polygrapher who ran the lie detector test.
"John Grogan is a fake," he added.
"This is the dude Kris Jenner had taken her lie detector test to make me look like a liar! And whats more sad is the network allowed it to happen!!"
Ray J then claimed he's going to sue "everybody" involved for "defamation".
He added: "I’m going on the biggest rant of my life tonight to clear my name of this negativity and show you how these people are f***ing devils — after this finale!!!"
In another video, Ray J said he plans to release all of the documents he has on the sex tape to prove that he's right.
Earlier this week, James Corden asked Kris a number of questions while she was hooked up to the machine, including: "Did you help Kim release her sex tape?"
The audience gasped but Kris replied: "It's Okay. No, no."
James' colleague confirmed the matriarch was telling the truth, to which Kris replied: "We cleared that up!"
In a furious rant earlier this month, Ray J hit out at momager Kris for allegedly telling “false stories” about him and reportedly attempting to “ruin” his family.
He slammed Kris on Instagram in response to Kayne West’s recent outburst.
West whipped the internet into a frenzy after telling fans to grab the popcorn as he shared a screenshot of what appeared to be a conversation between himself and his ex-wife Kim, 41, – with Kris pleading to be left alone.
The Shade Room picked up the story, sharing it with their 27million followers on Instagram.
It was in their comment section that Ray J came for Kris, claiming that she was somewhat behind the release of Kim’s sex tape.
"What about my mom Kris? You telling people false stories about me, making the black man look horrible, for your gain,” he commented.
He claimed Kris introduced him to Steven Hirsch, to CEO of Vivid – the company that released his now-famous sex tape with Kim in 2007.
The ex-couple, who got together in 2002 when they were just 21, made the adult film during Kim's birthday celebrations that year.
“You introduced me to Steve HIRSH, you masterminded everything 4 your family, and tried to ruin mine at the same time smh,” Ray J claimed.
“You don’t think all mothers get stressed ? Or you special huh? - I know it’s old and I don’t care — this makes me sick - but God had my back and still does.”
This isn’t the first time that Ray J has made these claims, previously giving an explosive tell-all interview in May earlier this year.
“I've sat in the shadows for over 14 years allowing the Kardashians to use my name, to abuse my name, make billions of dollars over a decade-and-a-half talking about a topic I've never really spoken about,” he told DailyMail.com.
Last month on Instagram, Kanye shared a screenshot of a message from Kim which read: “From my mom - PLEASE. Tell him to please stop mentioning my name. I'm almost 67 years old and I don't always feel great and this stresses me to no end.“
The artist replied: “Y'all don't have so so over my black children and where they go to school. They will not do playboy and sex tapes. Tell your Clinton friends to come get me. I'm here.“
