ELLE cover star Rosie Huntington-Whiteley stepped out in not one, but two Burberry dresses last night.

The model/actress wore a midnight-blue satin gown for the blue carpet at the Transformers 3 premiere in London. Cut on the bias to emphasise her lithe figure, the dress stayed just this side of backless with a beaded strap running down the centre of Huntington-Whiteley’s back.

‘Rosie has an effortless beauty and an incredible body,’ Burberry Chief Creative Officer Christopher Bailey said of his beauty model. ‘She has been part of the Burberry family since she was 17 and we are enormously proud of her success.’

Huntington-Whiteley has appeared in a trove of floor-length gowns lately, from Michael Kors’ sheer chiffon number in Rio to the silver sequinned Naeem Khan gown she wore to Transformers’s German premiere.

Watch Rosie’s Behind the Cover shoot