Helena Bonham Carter Wears Dress Designed by Colleen Atwood to the Oscars

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Unlike past red-carpet looks, Helena Bonham Carter sported a more simple look at the Academy Awards on Sunday.

Asked about her look on E!'s red-carpet special, she told Ryan Seacrest, "I don't know. This is something I got together with costume designer Colleen Atwood."

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Bonham Carter said she figured it would be "nice to celebrate film," not "fashion," so she enlisted Atwood (who designed the duds in Bonham Carter's Oscar-nominated flick Alice in Wonderland) to help with her red carpet dress.

The only downfall: She said she thought the dress might make her bum look "bigger."