Emmy Rossum is ''very excited'' to partner with Burt's Bees Beauty.

The 31-year-old actress has been announced as the face of the cosmetics brand's new campaign I Am Not Synthetic, and the star is honoured to join forces with the label because she has always been a fan of the company and is a huge fan of their tinted lip balm.

Speaking to PEOPLE, the 'Shameless' star - who portrays Fiona Gallagher in the American series - said: ''I've been using Burt's Bees products on 'Shameless' for a long time. [My character] Fiona has a very natural look. The Burt's Bees tinted lip balm is all we use on Fiona, and their eyeliner as well. So I was very excited to get involved with the campaign. The products themselves are made with natural ingredients and not tested on animals and that really hit home on a number of levels for me.

''So this campaign is not just about being synthetic, it's the idea of being a real woman.

''The visuals of the campaign feature real women who are embracing their authentic beauty. They are not feeling pressure to conform to a homogenised or overly artificial idea of beauty and they're kind of just bringing out their natural beauty.''

''Having a lipstick that has jojoba oil and other things in it that makes it feel really nourishing is really nice.''

Not only does Emmy swear by Burt's Bees lip products but she also is an avid user of their face oil, which she uses as a highlighter to accentuate her features.

She explained: ''I like it not only before bed but I like it even over makeup. In lieu of highlighter, put some on your cheekbones, above your cupid's bow, and down your nose -- it makes your face look really healthy and moisturised.''

Emmy has revealed she doesn't wear a face full of make-up because her husband Sam Esmail loves the ''blue vein'' under her eye.

The 'The Day After Tomorrow' star explained: ''My husband's favourite thing about my face is the blue vein under my eye, so I don't often wear under eye concealer in my everyday life because he likes to be able to see my actual face. So I think it's the idea of being true to yourself and being the best version of yourself and not the best version of somebody else.''