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Best Actress Oscar winner Sandra Bullock didn't decide on an Oscar dress until the day before the show.

What made her settle on her shimmering gold beaded Marchesa gown?

"Somebody helped me decide – my oldest stepdaughter," The Blind Side star, 45, told on the red carpet. "It was her favorite."

The only downfall?

"I know nothing on how to stay comfortable," she told Us.

Getting ready for the big show was "pretty calm," Bullock told Us. "I got up a little later than I normally do, and I let everyone else do the work. If I'd done the work, I wouldn't look like this, that's for sure."

The day before she won her Oscar, Bullock took home two Golden Raspberry Awards. She nabbed Worst Actress of 2009 for All About Steve and shared Worst Screen Couple with her Steve costar Bradley Cooper.

She is now the first actress to win a Razzie and an Oscar over the same weekend.

"They'll sit side by side in a nice little shelf somewhere..." she joked backstage. "The Razzie maybe on a different shelf, lower."

She said she "had the best time" picking up her Razzie. "It probably means more that both of them happened at the same time because it's the great equalizer. Nothing ever lets me get too full of myself."

The actress told Us she plans on celebrating her winning weekend with a burger and a nap.

Said Bullock, "I want to take the shoes off ... eat and not worry that the dress will bust open!"