In scenes set to air on the Channel 5 reality series tonight, the 35-year-old model hits out at the Queen of Clean, 74, during a heated argument.
Kim told Nicola: “Grow up, you’re a mum,” leading the latter to blast back: “And you’re not, that’s your problem, if you wanna go low, I’ll go lower.”
The How Clean Is Your House? star previously spoke candidly about burying her stillborn baby secretly as an unmarried mother in her 20s in Liverpool.
While it is not known whether Nicola was aware of Kim's history, they are more than likely to have left the Channel 4 star upset.
Nicola's harsh response comes after a fiery confrontation during face-to-face Celebrity Big Brother nominations when Kim got personal and branded her a "bad mum" and brought her children into the spat.
“Tell everyone how I’m a liar?” Nicola shouted after Kim, who had been denying she had made such remarks.
“She’s a mother-f***ing little b**h,” Nicola shouted and revealed that Kim had spoken to her since the face-to-face nominations to say, “'Nicole, would my kids want to hear me swearing'?”
Nicola McLean and Kim Woodburn lash out at each other on Celebrity Big Brother
Kim Woodburn slammed Nicola McLean on Celebrity Big Brother
And you’re not, that’s your problem, if you wanna go low, I’ll go lower
A while later, Kim and Nicola were still having the “liar” conversation which is when the cruel baby slur was made.
The latest instalment will also see Kim clash with Stacy Francis over laundry.
The 47-year-old US star lashed out at Kim, telling her it was not acceptable to treat other housemates’ property badly.
Stacy found her wet clothes on the floor and Kim putting her own things into the washing machine.
Nicola McLean was on the rampage on Celebrity Big Brother
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Stacy Francis hits out at Kim Woodburn on Celebrity Big Brother
She said Kim was all apologetic today but may be a “schizophrenic” and that her behaviour came in contrast to the more aggressive way she was acting when she first entered the Elstree compound.
“When you came in and called someone a b***h,” Stacy told Kim.
She went on to tell Kim not to “f**k” with her today.
“And don’t you f**k with me, start with me and you’ll be very sorry,” Kim warned.
Celebrity Big Brother continues on Channel 5 tomorrow at 9pm.