Earlier this week (7 May), pregnant Katie confirmed her plans to divorce Kieran after accusing him of having a seven-month sexual affair with her close friend Jane Pountney.
Speaking exclusively to Reveal about the cheating claims at the launch of Tracie Giles' salon yesterday (8 May), Chantelle said: "I think that Kieran and Jane are scum of the earth. It's the ultimate betrayal, there's some real nasty people in the world and there's two of them right there."
Just a few days before news of their divorce broke, Katie announced she was pregnant with her fifth child, making the allegations all the more shocking to some.
"It's disgusting," continued Chantelle. "To be pregnant and that be going on, with your best mate. It's not like she's only known her for a short time, she's known her for 20 years.
"To do that to another human being, there's just no words."
Kieran has not yet spoken out although Jane has confirmed the affair did happen.
Chantelle hasn't had the easiest time herself on the relationship front. She was engaged to Katie's ex-husband Alex Reid but the couple parted ways in 2012, with Chantelle later admitting she was "in hell" following the split.
Speaking about her own break-up experience, Chantelle said: "It can be the hardest thing in the world, but you get through it. It doesn't own you."
Got an iPad or iPhone? Reveal Mag is specially designed to fit!
Katie Price's past boyfriends in pictures:
Copyright: PA Images