The frontwoman has followed in the footsteps of Rihanna and rapper Nicki Minaj and teamed up with brand officials to create a four-piece collection which reflects her fiery personality - the lipstick, eye shadow, blush/bronzer and nail polish are all in shades of the singer's favourite colour, orange.
Williams, who regularly dyes her hair orange, reveals she chose to collaborate with Mac because it was a product from the brand which helped her to come alive onstage early on in her career with Paramore.
She tells People.com, "It matches my soul... I didn't wear make-up at all. Photographers would beg me to wear chapstick and I'd say no. I went to a (store) and picked up orange eye shadow from Mac, that was the beginning of the end. It's been key in making me feel like I have an onstage personality."
The mini collection will go on sale online next month (Apr13).