At last night's London premiere of Emma Watson's latest film, The Perks of Being a Wallflower, the actress and fashion icon wasn't sure which item of clothing would be most appropriate, a party-perfect LBD or chic, sleek trousers. So she wore both! And you know what, we kinda like it! Emma's gorgeously girly black strapless prom dress does a good job of adding curves to her otherwise petite frame and shows off her chiseled shoulders, allowing her to wear a striking necklace too. Juxtaposed to this was Emma's choice of legwear- smart tailored trousers that would look at home in a three-piece suit. This shouldn't work but some how it does as Emma has kept it simple, pairing a plain black dress with plain black trousers- how very Gucci SS13! Teamed with black stilettos and the finishing touch of her trademark stud earrings and youthful haircut Emma looks the perfect mix of young star and fashionista. Not sure if trousers and a dress is the look for you? Have a look at Team LBD's less out-there alternative: Lipstick Boutique Demi Dress, £65, Rok Chix Silver and Uncut White Diamond Stud Earrings, £55, Bourne Sara Shoe in Black, £149, Cinderela B Luxe Neon Mother of Pearl Necklace in Silver, £35, Bebaroque Bryant Footless Tights, £49.99. Shop all prom dresses here. And add a Emma-esque twist with Bebaroque leggings here.