Taking the plunge in a dazzling ivory Givenchy gown with a deep V-neckline and sparkling Fred Leighton jewels, Oscar nominee Rooney Mara took our breath away when she arrived at the 2012 Oscars in Hollywood, on Sunday.

The 26-year-old actress is nominated for her role as Lisbeth Salander in The Girl with the Dragon Tattoo, but she's got some stiff competition tonight!

Mara recently revealed to USA Today of the sole requirement for her Oscar dress, "I don't think about it [choosing a dress] in terms of what people say or like or think. I try to find something that I feel comfortable in. I do like fashion, but if it's not comfortable, I won't wear it."