Kristen Stewart wore:

Dress:  Valentino

Shoes:  Sergio Rossi

Coat:   Burberry

She was styled by Tara Swennen.

Nikki Reed wore:

Dress and Belt:  Burberry

Shoes:  Christian Louboutin

Clutch:  Judith Leiber

Jewelry:  Dana Rebecca Designs

She was styled by Rebecca Resnick.

Kristen Stewart wore:

Dress:  Gucci

Shoes:  Burberry black platform pumps.

She was styled by Tara Swennen.

Dominic Cooper wore Burberry to the premiere.

Andy Samberg wore Burberry.

Bryan Cranston wore Burberry.

Chris O'Donnell wore a tux from Giorgio Armani and the shoes were from Cole Haan.  His cufflinks were from Martin Katz.  He was styled Wendi & Nicole.

Desmond Harrington wore Calvin Klein Collection.

Gabriel Byrne wore Calvin Klein Collection.

Hugh Laurie wore Burberry.

Hunter Parrish wore a one-button Dior suit and Marc Jacobs shoes.  He is styled by Chris Horan.

Jack McBrayer wore Calvin Klein Collection.

Jamie Kennedy wore a tux from Reiss and was styled by Dorothy Amos.

Jason Siegel wore John Varvatos.

Jeremy Piven wore Dolce & Gabbana, with shoes from Tom Ford.

Jerry Ferrara wore Hugo Boss.

John Slattery wore Calvin Klein Collection.

Jim Parsons wore Calvin Klein Collection.

Jimmy Fallon wore Tom Ford.

Jon Cryer wore Moschino Uomo.

Justin Timberlake wore William Rast with Dior shoes.  He was styled by Annie Psaltiras.

Kevin Bacon wore John Varvatos.

Kevin Connolly wore D&G.

Kevin Dillon wore Hugo Boss.

Kyle MacLachlan wore Hugo Boss.

Michael J. Fox wore Calvin Klein Collection.

Michael C. Hall wore Calvin Klein Collection.

Neil Patrick Harris wore Dolce & Gabbana.

Omar Epps wore Burberry.

Rainn Wilson wore Burberry.

Rex Lee wore a Brooks Brothers tux and platinum, diamond and sapphire cufflinks and shirt studs from Jacob & Co.

Ryan Seacrest wore Burberry.

Stephen Colbert wore Brooks Brothers.

Stephen Moyer wore Dolce & Gabbana.

Todd Holland wore Hugo Boss.

Tony Shaloub wore Hugo Boss.

The Jonas Brothers had two looks during the show.  For arrivals, Kevin wore a two piece suit and shirt look from Dior Homme.  Joe wore Burberry with Vans, and a necklace from Jelena Behrend.  Nick wore a Moschino suit jacket with Jonas Brothers jeans and Gucci loafers.

For the performance Kevin wore a D&G jacket.  Joe wore a customized t-shirt & belt from Traffic in Los Angeles with Marc Jacobs shoes.  Nick wore a Burberry leather jacket with medals from Jelena Behrend and boots from John Varvatos.

They were styled by Michelle Tomaszewski.

Emma Watson wore Proenza Schouler from the Resort 2010 collection with shoes from Burberry.  She was styled by Caroline Sieber.

Michelle Trachtenberg wore a casual ensemble of American Apparel leggings with a shirt from Tucker and a blazer from Topshop.  Her shoes were Guiseppe Zanotti and her bag was from Kooba.  Earrings and ring were from Rarities by Carol Brodie.  She did not work with a stylist for this event.

Ashanti also styled herself to attend the premiere.  She wore pop colors of an Herve Leger skirt with a Ramona LaRue top.  Her boots were also Guiseppe Zanotti.  Jewelry was from Lorraine Schwartz.

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Hayden Panettiere had on a hot little Stella McCartney mini with a pair of Louboutins.  She carried a Jimmy Choo "Cloud" clutch.  Jewelry was from Cathy Waterman.  She was styled by Logan Horne.

Halle Berry wore a sexy - and very little - little black dress by Riller & Fount with shoes from Camilla Skovgaard.  Her jewelry was from Suzanne Wilson.

Mila Kunis wore a dress from Milly with a pair of Stella McCartney heels.  Her jewelry was Bochic bakelite, diamond and blue sapphire cuff bracelet.  She was styled by Tara Swennen.

The amazing Alexandra Zosman (pictured with guest) wore a McQ black wool jumpsuit with Burberry black patent heels.  She carried a Fendi clutch.  Jewelry was from David Yurman.  She did not work with a stylist for this event.

Malin Akerman wore a cute red sequin dress from Brit designer Jasmine di Milo paired with Betsey Johnson shoes.

Leslie Mann wore a periwinkle Moschino satin dress with a tiered skirt from the SS09 collection.

Halle Berry wore a black knit dress with sheer panel & cap sleeves from Herve L. Leroux.

Lynn Collins wore an Emanuel Ungaro dress.  Shoes were Camilla Skovgaard gold leather and chain shoes.  Click through for detail shots ... Cuff is H. Stern Zephyr in 18K yellow gold.

Fergie wore a Vena Cava dress with Balenciaga shoes.  Her earrings were from Chrome Hearts and ring from Noir.  She was styled by Laura Lightbody.

Anjelica Huston arrived with her nephew Jack wearing Michael Kors pants with an Armani tee and Burberry trench.

Garcelle Beauvais wore a dress from L.A.M.B by Gwen Stefani.

Mary Lynn Rajskub wore a ruby red ribbed knit cocktail dress from David Meister.

Hugh Jackman wore a grey flannel custom 2-button suit, white shirt and shoes from Ferragamo to the premiere.  And was just generally handsome, as usual.

Click through for accessory shots

Kristen wore an Herve Leger dress and Burberry shoes.  She was styled by Tara Swennen.