Check out our first installment to see which stars nailed it and who was a fashion mess. And don't forget to check back each week to see who made the cut.
Best and Worst Oct week 2
Hot off Alber Elbaz's s/s 2011 catwalk, Blake Lively worked this beautiful halter-harness dress to perfection on the red carpet, showing off her mile-long legs and completing the look with a swept-back updo and studded sandals.
The bra may be worth $2 million, but this outfit certainly isn't. Surely there was a more stylish way - not involving taffeta and opera gloves - to show off Adriana's prized assets?
Halle Berry looks stunning in this gold strapless sequinned mini-dress by Reem Acra. Since the dress did all the talking, she kept the accessories to a minimum, working a pair of oversized gold hoops and peep-toe platforms.
Jumpsuits are tough enough to pull off as is, but factor in the lacy fabric and the overall look is unflattering.
This floral gown, stylish chignon and touch of Carrie Bradshaw's quirkiness in the accessories made Sarah Jessica Parker's political ensemble a winner.
Despite the pretty seafoam hue, this whole look is less than spectacular and would have benefited from a pulled-back hairstyle and better footwear.
Keira Knightley looked stunning in this beaded cream Chanel dress, which was demure and sexy at once.
While Keira's dress was a style hit, Gillian Anderson had a major fashion mishap at the same event in an ill-fitting mint green dress with frayed hemline.
Girls Aloud's Walsh looks chic and pretty in a camel-hued (the colour of the season) asymmetrical dress at the launch of her jewellery range in London. If she'd ditched the black tights for bare legs, this great ensemble would look even better.
Quelle horreur! Cotillard is usually a super savvy dresser, but this leather corset dress (which she's busting out of), messy hair and vampy lip made the overall look more tramp than triumph.