PHOTOS: 2010 Metropolitian Museum of Art Costume Institute Gala

Mike Nichols and Diane Sawyer  (Evan Agostini / Associated Press)

Chloe Sevigny  (Peter Kramer / Associated Press)

Janet Jackson in Lanvin  (Timothy A. Clary / AFP / Getty Images)

Bar Refaeli  (Stephen Lovekin / Getty Images)

Sienna Miller, in Emilio Pucci, with Jude Law  (Larry Busacca / Getty Images)

Thandie Newton  (Justin Lane / EPA)

Naomi Campbell in Dolce & Gabbana  (Peter Kramer / Associated Press)

Mary J. Blige  (Evan Agostini / Associated Press)

Christina Hendricks in L’Wren Scott  (Timothy A. Clary / AFP / Getty Images)

Nicole Richie  (Larry Busacca / Getty Images)

Emilie de Ravin  (Stephen Lovekin / Getty Images)

Narciso Rodriguez and Julianna Margulies  (Larry Busacca / Getty Images)

Jennifer Lopez in Zuhair Murad  (Peter Kramer / Associated Press)

Katy Perry  (Larry Busacca / Getty Images)

Marion Cotillard in Dior  (Larry Busacca / Getty Images)

Naomi Watts  (Larry Busacca / Getty Images)

Rachel Zoe  (Stephen Lovekin / Getty Images)

January Jones in YSL  (Larry Busacca / Getty Images)

“Gossip Girl’s” Jessica Szohr  (Stephen Lovekin / Getty Images)

Zoe Saldana in Calvin Klein  (Stephen Lovekin / Getty Images)

Diane Kruger and Joshua Jackson  (Larry Busacca / Getty Images)

Vogue editor in chief Anna Wintour in Chanel  (Stephen Lovekin / Getty Images)

Joy Bryant in Marchesa  (Stephen Lovekin / Getty Images)

Emma Watson  (Stephen Lovekin / Getty Images)

“The Blind Side” actress Lily Collins  (Stephen Lovekin / Getty Images)

Claire Danes  (Stephen Lovekin / Getty Images)

Donatella Versace  (Peter Kramer / Associated Press)

Kirsten Dunst in Rodarte for Gap  (Larry Busacca / Getty Images)

Brooke Shields, wearing Michael Kors, and standing with ... Michael Kors.  (Larry Busacca / Getty Images)

Sarah Jessica Parker  (Larry Busacca / Getty Images)

Padma Lakshmi  (Stephen Lovekin / Getty Images)

Naomi Watts and Liev Schreiber  (Stephen Lovekin / Getty Images)

Model-actress Riley Keough and designer Thakoon Panichgul, who designed her dress.  (Larry Busacca / Getty Images)

Kate Hudson  (Stephen Lovekin / Getty Images)

Sean Combs  (Evan Agostini / Associated Press)

Jessica Biel and Justin Timberlake were Ralph Lauren’s guests to the gala.  (Peter Kramer / Associated Press)

Taylor Swift in Ralph Lauren Collection  (Evan Agostini / Associated Press)

Kristen Stewart  (Larry Busacca / Getty Images)

Maggie Gyllenhaal  (Stephen Lovekin / Associated Press)

Elizabeth Banks in Gucci  (Larry Busacca / Getty Images)