George reminded viewers that Madi, who has returned to the show this season for another shot at fame, was on Team Kelly team last year - and Kelly chose eventual winner Sam Perry over her.
An enraged Kelly said: "I can't hear anyone talking" as she tried to ignore George's comments.
Then, visibly annoyed, she yelled at George: "Don't you put your finger in my face!"
After the slanging match between the judges, Madi eventually picked Team George.
Kelly took it gracefully and went and hugged Madi, saying that she will still "cheer" her on through the competition.