The I'm A Celebrity star, 66, told Nigora she had called lawyers after a nasty dispute on Twitter.
It's no secret that Lady C and Duncan clashed in the jungle, before she left mid-series amid claims of 'bullying'.
Then, just days ago, author Lady C accused Duncan of physical assault - a claim he vehemently denies.
And on Saturday (12 December), Duncan's stunning girlfriend Nigora provoked Lady C into a fight telling a friend: "I kept quite for a while, now I will not let her to bully or belittling my man!"
Referring to Lady C's appearance on Alan Carr's Chatty Man, where she angered some viewers with her comments about Princess Diana, Nigora tweeted: @LadyColinCampb @AlanCarr someone who's hinging on to her fake title, to judge Princess Diana?! How dare !! Slagging off someone who's dead!"
Not one to shy away from a fight, Lady C replied: "@wnigora_nigora @AlanCarr The only fake is you. http://sugardaddys.com? I started as D's official biog. My title is genuine. Monaco expert."
Nigora responded: "A wasted evil creature you are! Someone who had never had an orgasm, slept in separate bedrooms with weird man sad."
To which Lady C bit back: "@wnigora_nigora @AlanCarr This is defamatory and untrue. My Lawers will be in touch. You have no status with me. You are dismissed."
@lindaraper darling don't worry...I kept quite for a while, now I will not let her to bully or belittling my man!— Nigora Whitehorn (@wnigora_nigora) December 12, 2015
During her interview on Alan Carr's popular chat show, which aired on Friday 11 December, Lady C punched below the belt - literally - when she belitted the size of Duncan's manhood.
She told Alan: "I couldn't believe that anyone with so little to flaunt would flaunt it.
"I felt sorry. He had on underpants that were very sheer and lightweight. It was like one teensy-weensy little peanut in a husk with two shelled peanuts on either side."
Hmmm, so you must have been looking Lady C!
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