The 25-year-old gave birth to Sophia Ruby, her first child with fiancé Peter Crouch, on March 14th.
The presenter has previously said that she is desperate to lose the weight she gained during her pregnancy.
A source told The Sun that Clancy's rapid return to a slim figure is a result of the cereal diet that she has chosen to follow, saying: "Abbey has put her post-baby body down to Rice Krispies.
"Everyone has been commenting on how good she looks and asking how she's got her body back. She's told them it's because of the cereal. Whenever she's home and feeling peckish she pours herself a bowl."
Earlier this week, it was reported that the model had dismissed speculation that Crouch visited an air hostess at a Dubai hotel in the early hours of the morning while Clancy was heavily pregnant.