The actress isn't afraid to go unglamorous

Jennifer Aniston has debuted a rather scary new look on the set of her new film Cake.

The Friends star, 45 – who’s engaged to actor Justin Theroux – was snapped filming scenes in LA yesterday with deep scars across her face and neck.

The fake marks were made more prominent by the fact that Jennifer was wearing no make-up and sported an unglamorous lank-looking brown bob.

She was dressed down in a grey long-sleeved top and matching trousers.

The black comedy sees Jennifer play Claire Simmons, a grieving mother who becomes fascinated by the suicide of a woman from her chronic pain support group.

Claire forms a poignant relationship with the late Nina‘s husband – portrayed by Sam Worthington – as she struggles with her own personal tragedy.

Anna Kendrick stars as Nina, while other actors involved in the project include William H Macy, Meryl Streep‘s daughter Mamie Gummer and Chris Messina.

Both Anna, 28, and Sam, 37, were seen shooting alongside Jennifer yesterday.

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Anna Duff