Natalie Portman appears naked in her latest avert for Dior.

The 'Black Swan' actress appears draped across a chaise lounge to promote Rouge Dior Nude Lipcolor.

The range of lipcolours comes in eight shades, including a special hue, Grège #169, proceeds of which will benefit Natalie's chosen charity, the Free the Children Association.

The star picked the hue specifically as it is one which she wears herself.

She said: ''I chose the colour Grège because it's the one I'd pick to wear myself.

''The number 169 contains different dates that are important to me and my family.''

Natalie is no stranger to appearing naked in adverts for the French fashion house, previously being shot for Miss Dior Cherie Fragrance naked from the waist up, with her hands over her chest.

The new advert is marked because it is the first Natalie has appeared in since John Galliano was fired from Dior after going on an anti-Semitic rant in Paris, something Natalie publicly denounced, saying she was ''deeply saddened and shocked'' by the designer's actions.

John was subsequently replaced by former Jil Sander creative director Raf Simons.