The cover star of Interview Magazine, Jennifer Aniston proves that she is fit as ever at 51. 

Jennifer Aniston is fighting fit at 51 and her Interview Magazine cover is all the proof one needs.

Rocking a pair of black shorts, with a leather jacket and matching knee-high boots, she wows on the cover as she flaunts her toned legs.

With her hair worn in an unkempt manner, she opted for a make up free look.

The digital cover was released on Jennifer's 51st birthday and the actor couldn't control her excitement as she shared the news on Instagram.

'Thank you @interviewmag for this birthday surprise. I had no idea this would be coming out today,' she gushed on the social-media, photo-sharing app.

'Feeling proud and honored to be celebrating with this cover. Thanks to the Interview team for celebrating women at every age… turns out 51 is pretty fun.'

For the special issue, friend and drinking buddy Sandra Bullock has interviewed Jennifer, who has spoken about relationships.

'I think that it comes from growing up in a household that was destabilised and felt unsafe, watching adults being unkind to each other, and witnessing certain things about human behaviour that made me think: 'I don't want to do that,'' she revealed.

'You can either be angry or be a martyr, or you can say, 'You've got lemons? Let's make lemonade.''