"What she said was, 'I just don't eat,' and then she laughed and said, 'Of course I'm joking, I must have a fast metabolism'".
Her spokesman added: "Natasha's a mother herself and knows she's got to be very responsible about things like this. She's very upset because it's been taken out of context."
Natasha made the joke when she and the other Kittens were opening a theme park ride at Drayton Manor Park in Staffordshire.
A spokesman for the Eating Disorders Association said: "Actually a healthy diet is a vital part of keeping and looking good. Dieting should never be undertaken by young people unless it's under medical supervision."