03/14/2011 at 01:00 AM EDT
in Vera Wang
"I just put it on, and it made me happy," says Bullock of her silk faille dress. It made her son Louis, 1, happy too: "He loves red!"
in Calvin Klein Collection
The first-time Oscar nominee (in understated earrings and a bangle by Chopard) revealed her slimming secret: "Spanx! That is how I keep my figure."
in Valentino Haute Couture
"I couldn't feel more like a princess slash movie star slash luckiest girl in the world," says the Oscar host (in a vintage gown and Tiffany & Co. jewels).
in Dolce & Gabbana
The singer-actress' Judith Leiber bag wasn't the only stylish accessory on her arm: She graced the Vanity Fair
Oscar party with boyfriend Justin Bieber.
in Monique Lhuillier
The True Blood
star paired her cocktail dress with Chopard jewels and Brian Atwood heels for the Vanity Fair
in Atelier Versace
In the days leading up to slipping into her tangerine confection, "I tried to stay away from carbs," Hudson told PEOPLE. It paid off: "I feel amazing!"
Her Oscars debut in 2007.