Here's Penn representing the good cause.
Other celebrities involved are Shiloh Fernandez, Selma Blair, Nikki Reed and others. The collection is available to buy in-store or online at shop.hm.com and can be found in H&M's Divided section.
What do you think of the collection? Loving celebs and fashion are doing their bit for charity? Will you be buying anything from this collection? Comment below :) xx