AMAs 2010: Best/Worst Red Carpet Style

Taking a break from her signature cascading curls and floor-sweeping gowns, the winner and performer of the night sparkled in a sleek Collette Dinnigan mini with an edgy new hairstyle to match. Grade: A

Before performing in a ruby red catsuit later that evening, the usually splashy Perry walked the red carpet in a sweet and simple Badgley Mischka Couture dress. Grade: B

The ''Raise Your Glass'' singer, who just announced she's pregnant, put a rock'n' roll twist on her classic Janey Lopaty Vintage with a purple-grey hairdo. Grade: B-

The feathers added edge, the shoulders added high fashion and the sparkles added glamour, but all together, there were too many Peas in the pod for Fergie's Falguni & Shane mini. Grade: B-

We like the intricately wrapped Marchesa mini, but we wonder how many people asked Cyrus if she had toilet paper stuck to her heels. Grade: C

Between the Fatal Attraction hair style and the lackluster imitation of Halle Berry's Oscar gown, we much prefer the elegantly slinky Elie Saab Haute Couture gown Rihanna wore to pick up her AMA trophy for Female Soul/R&B Artist to this maroon dress, also by Elie Saab. Grade: C

The Burlesque actress and former Dancing With the Stars pro showed off perfectly coiffed retro curls with an ornate lace Marchesa dress — and botched it all with a wad of unnecessary sheer fabric on the bottom. Grade: D+

With Halloween long gone, someone should've told Jenny McCarthy that her Fred Flintstone costume — by way of Stella McCartney — is outdated for this party. Grade: D

Klum has many titles to her name — supermodel, actress, producer, TV host — but is gothic grandma next? Grade: F

No letter of the alphabet can truly sum up the head-scratchers that are Nicky Minaj's Manish Arora dress, Ke$ha's studded eyebrows, gold faux hawk, and halter made of VHS tapes, and Willow Smith's custom one-piece.