Sparkling Sienna Miller

Mar 14, 2007, 13:10 GMT

British actress Sienna Miller arrives for the UK premiere of George Hickenlooper\'s film \'Factory Girl\' in London, Tuesday 13 March 2007. EPA/DANIEL DEME

Sienna Miller dazzled at the London premiere of 'Factory Girl' last night (13.03.07).

The 25-year-old star, who plays artist Andy Warhol's muse Edie Sedgwick in the 60s movie, arrived at the glitzy Leicester Square event wearing a vintage gold beaded Balenciaga mini-dress.

When asked if she had considered wearing the black pants she donned in homage to Edie for the New York premiere, she joked: "Oh, did you want pants? Well, you never know you might get a treat later!"

Sienna was accompanied by her sister Savannah and the siblings were keen to speak about their new clothing line Twenty8Twelve.

Sienna said: "My sister is wearing one of our outfits. This is the first look of the clothes we designed together. It's coming out in July and it's called Twenty8Twelve because that's my birthday."

The British actress - who co-stars in the movie with Guy Pierce and Hayden Christensen - also revealed she is doing her best to "go green".

She told BANG Showbiz: "I switch off all my plug sockets every night and always unplug my phone charger. I think it's time to make some changes we've got a 10-year window. Just switching of your plus sockets or having a shower instead of a bath can save a tonne of carbon. It's important."

(C) BANG Media International