According to The Sun, the GMTV presenter is scared that her breasts will pop out of her dress because of the dance's intensity.
She said: "The dance I am doing is so bouncy and I am breastfeeding at the moment, so everything is quite inflated.
"But I am up for making a fool of myself. If you look me up in the dictionary, it says, 'Glutton for punishment'."
The 42-year-old added: "It's hard to imagine being worse. But I am worried that I'll forget everything and Richard will have to elbow me in the ribs."
The show, which also features Mark Rhodes and former Pop Idol star Sam Nixon, airs tonight at 7.15pm on BBC One.