The TV actress, who is taking part in this week's final, claimed that the duo were "nice", but tough to impress.
"They are both so nice, but equally scary," she told The Mirror. "You just want to say to them, 'can you help me a minute?' and they just walk away. Gregg's so cheeky."
Speaking about her experiences on the reality TV show, she claimed that her old problems of suffering from stage fright occurred when she competed in the kitchen.
"I've suffered with stage fright and Paul McKenna actually hypnotised me a couple of years ago to help me with it, but MasterChef was terrifying. It's brilliant but terrifying," she said.
The Celebrity MasterChef final starts on Wednesday at 8pm on BBC One.