05/15/2006 at 01:00 AM EDT
Oscar de la Renta
"I don't even have to think when I'm in this dress," said Barrymore. "It just does it all for me. I love that. It puts everything where it needs to be."
Dior Haute Couture
Theron accessorized her gown with a 19th-century diamond necklace and brooches from Fred Leighton—and designer John Galliano, with whom she walked the red carpet.
After arriving with husband Marc Anthony, the star sat at a table that included Lenny Kravitz, Rupert Everett and Donatella Versace.
"I figured everyone would be wearing black, and this was different," said Alba of the Francisco Costa design, adding she's more "a baseball cap type of girl."
LOVE AT FIRST SIGHT
This dress from the fall '06 collection was the first Lohan tried on.
"The dress is called the Deco Rose dress and is the epitome of chic and class," said Rachel Zoe, Lohan's longtime stylist. "She looked like a princess."
"The minute she put it on, we just loved it," said Newton's stylist Jessica Paster. "It's low-backed and all hand-beaded. It gave us that great Studio 54 vibe."
The Six Million Dollar Necklace
Sure, her custom-made Rachel Roy gown was stunning. But it was the 151.05-carat Harry Winston necklace that had all eyes on Melania Trump. "It was the perfect night to wear it," she says. That sparkler was a loaner—but she gets to keep the diamond bracelet her husband gave her earlier that night to honor the birth of their son Barron.
THEY DESIGN TOO!
Armed with their own sketches, Mary-Kate & Ashley Olsen co-created their Badgley Mischka gowns. "They wanted to be put together and couture and lady-looking," designer Mark Badgley said.
Who says plaid and tulle don't mix? Not SARAH JESSICA PARKER
, in Alexander McQueen.
Event co-chair SIENNA MILLER
flashed some Brit love—and her legs!—in Burberry.
EMMY ROSSUM hid a sexy sheath under a cadet-inspired Ralph Lauren Collection jacket.
"I don't usually do updos," EVA MENDES says. "But since this is such an extravagant event I decided to go for it."
BEHIND THE SCENES
Rosario Gets Ready
Ah, the challenges of the strapless dress. First, there's the worry that "you'll be yanking it up all night," Rosario Dawson explained. Or that the bodice will be so tight, she adds, "that it does that thing where it makes the double cleavage or gives you back fat." Enter designer Gilles Mendel, who runs his family's celebrated fashion label, J. Mendel. He created a mold of Dawson's figure and then, with the help of 12 seamstresses, crafted an invisible corset inside this custom-made, silvery-gray, shantung column gown from his fall '06 collection. The end result? "It's actually totally comfortable!" Dawson said.