Sienna attended the London premiere of her new film, Factory Girl, with her sister, Savannah. She co-stars in this film with Guy Pearce and Hayden Christensen, playing the role of fictionalized role of Edie Sedgwick–a 60’s socialite who drops out of Cambridge, meets Andy Warhol and tries to attain her dreams of superstardom. A while ago, we reported on the rumors that the infamous sex scene between her and Hayden Christensen was REAL and none of the usual ‘movie magic’ that we’re used to! If anyone has seen this, let us know what you thought was really going on between the sheets!

And just as a side note, Mary-Kate Olsen has a smal role in this film. Keep your eyes peeled. She’s such a small girl that you’ll probably miss her! Check out the trailer below: