The TV presenter, musician and model, below, who first found fame in the band Hear'Say almost a decade ago, has teamed up with the frozen food firm as a celebrity expert.
The 32-year-old mother-of-one, who is also a face for high street chain Marks & Spencer, will show off her toned body to demonstrate how people can get 100 per cent out of life.
Klass has created a "pre-tea active challenge", which consists of a series of simple exercises for families to do before their evening meal.
The challenges include "100 per cent Hula", "100 per cent Dance", "100 per cent Skipping" and "100 per cent Ball Games".
Birds Eye launched its 100 per cent Challenge to help families make the most of life.
The company chose 100 families out of thousands of entrants to take part, who will be supported by a panel of experts in three areas.
Klass will share her knowledge of an active lifestyle, while healthy eating tips will come from Amanda Ursell and Tanya Byron will assist with family life.
Details will also be available online.