The King Kong star is fronting an advertising drive for the company's limited edition purse to raise money for Breast Health International's Fund For Living, which offers support to women undergoing treatment for breast cancer.
Watts, who posed for the pictures at her home in Los Angeles, tells Wwd.com of the drive, "Those people that need extra help - like taking care of their children, getting to the doctors, the little details. Can you imagine having to deal with that level of crisis and then trying to maintain a life if you've got children? This just helps with managing things, having that extra support."
Watts follows in the footsteps of previous ambassadors including Renee Zellweger and Naomi Campbell.