In a recent interview, the 22-year-old admitted that she is often has a tendency to develop the odd spots and can feel awkward having her photograph taken.
"I look in the mirror and go, 'Oh no! More spots, more acne!' And I'm not comfortable being photographed when I'm being myself," the Mirror quoted her, as saying.
"I believe the Aborigines say that every photo takes away a bit of your soul. It's very odd but I think there's some truth in that," she added.
The British beauty further said that she doesn't like when people comment upon the way she looks.
"I don't like people who tell me I look crap, though! I think kindness is a good quality, and that doesn't always mean honesty," she said.
Keira is currently filming a low-budget drama, The Edge Of Love, alongside Sienna Miller and Cillian Murphy. The film, about poet Dylan Thomas, was written by Keira's mother, playwright Sharman MacDonald.