The Pantene Beautiful Lengths drive encourages people to grow their locks, get it cut, and donate it for making wigs for women who have lost their hair during cancer treatment.

Swank, who joins the campaign from 2008, will donate her own hair too.

"I have lost multiple family members to cancer and witnessed their struggle first hand," Contactmusic quoted her as saying.

"I've never heard of anything quite like Pantene Beautiful Lengths, and I'm proud to be asked to promote the goals of such a unique and heartfelt program," she added.