Hilary Duff, Jenny McCarthy, Padma Lakshmi and Christie Brinkley are working up a sweat -- and it's for a good cause!

The four gorgeous gals, ranging from 23-57 years of age, all took part in the new "Move for Change" initiative organized by Danskin -- which promotes maintaining healthy lifestyles and well-being of women and children.

The celeb spokeswomen are all seen showing off their own personal daily fitness routines in brand new campaign photos. Duff hikes, Jenny does yoga, Padma boxes and Christie dances while rehearsing for "Chicago."

Move for Change will also support four charities, one chosen by each star:

- Hilary's charity is Blessings in a Backpack, a non-profit organization that feeds poverty-stricken elementary school children.

- Jenny chose Generation Rescue, a non-profit organization dedicated to the recovery of children with autism.
- Padma supports The Endometriosis Foundation of America, a non-profit organization helping women suffering from endometriosis.
- Christie went with The Ellen P. Hermanson Foundation, a non-profit organization helping women and families who suffer from breast cancer.

Check out the behind-the-scenes shots from the campaign above!

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