Olsen sisters are Vogue's best dressed

Mary-Kate and Ashley Olsen have been named among the world's best dressed women, by US Vogue.

The designer siblings grace the cover of this month's best dressed supplement, which pays tribute to their style as well as other famous sisters, including Duchess Catherine and Pippa Middleton, Beyonce and Solange Knowles and Dakota and Elle Fanning.

Mark Holgate, Vogue Fashion News Director and Editor of the best dressed issue, said: "It's been a year of sisters, most famously with Catherine and Pippa Middleton. Their style is short enough to be impossible for an older-generation royal to wear, long enough to be decent when sitting or bending down to talk to a child.

"But are there any more chic, stylish, cool, and original sisters than Mary Kate and Ashley Olsen? They are incredibly stylish."

Ashely recently said of her twin's look: "I feel like Mary-Kate's constantly evolving. What she does is when she finds a proportion or a silhouette or a specific outfit, she'll wear it until she's over it - which could be a week or it could be a year."

Mary-Kate added about Ashley: "There's always sort of a sense of a bohemian vibe. She's quirky, modern, bohemian."

Meanwhile, in another poll, Jennifer Aniston has been named as one of the world's sexiest women.

The stunning actress joined the likes of Miranda Kerr and Natalie Imbruglia in Who magazine's Sexiest People 2011.

Jennifer, 42, shot to worldwide fame playing Rachel Green in hit comedy 'Friends' from 1994 to 2004 and now fans can see her in it again as 'Friends' is now being shown on Comedy Central.

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