MARCH OF THE PARTY GIRLS.

PHOTO (COLOR): MISCHA BARTON | AZZARO BY VANESSA SEWARD: The O.C. star went with the season's black-and-white trend for the afterparties.

PHOTO (COLOR): KATE BOSWORTH | CALVIN KLEIN: She paired her red silk chiffon (from the fall 2006 collection) with Jimmy Choo heels.

PHOTO (COLOR): KERRY WASHINGTON | GAULTIER PARIS: Arriving at Morton's, the Ray actress showed off an olive green chiffon dress from Jean Paul Gaultier's spring/summer 2006 collection.

PHOTO (COLOR): MADONNA | VERSACE: To set off a pink frock by her pal Donatella Versace, Madonna chose $10 million in Neil Lane jewels. SHE ROCKED! The star wore $10 million worth of diamonds:

PHOTO (COLOR): HEIDI KLUM | MICHAEL KORS: The Project Runway host relied on fellow judge Kors for a silk chiffon halter gown sprayed with crystals.

PHOTO (COLOR): TERI HATCHER | LANVIN: The Desperate Housewives star cheered on Felicity Huffman in a linen gabardine cocktail-length dress by Alber Elbaz for Lanvin.

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Written by Olivia Abel; Joyce Chang; Danielle Dubin; Rennie Dyball; Eleni Gage; Michelle Green; Mike Lipton; Jason Lynch; Bob Meadows; Joanna Powell; Lisa Russell; Karen S. Schneider; Jill Smolowe; Chris Strauss; Michelle Tan; Michelle Tauber; Alex Tresniowski; Ashley Williams; Marisa Wong and Jennifer Wulff; Reported by Bryan Alexander; Adrienne Bard; Margi Blash; Carrie Borzillo-Vrenna; Shannon Bradley; Alexis Chiu; Alicia Dennis; Jed Dreben; Alison Singh Gee; Katy Hall; Sara Hammel; Maureen Harrington; Lisa Helem; Diane Herbst; Jessica Herndon; Caroline Howard; Lisa Ingrassia; Oliver Jones; Julie Jordan; Amy Elisa Keith; Marisa Laudadio; Ivy Lee; Ken Lee; Elizabeth Leonard; Kristen Mascia; Jennifer Odell; John Perra; Monica Rizzo; Brenda Rodriguez; Praxilla Trabattoni; Cynthia Wang; Nicholas White and Ulrica Wihlborg