Kate Hudson has no idea who Katherine Heigl is.

"Who is she?" Hudson, whose movie Fool's Gold opened at No. 1 its first weekend, said in UK Elle. "Oh, that girl in 27 Dresses? I just don't think about that stuff."

Heigl's flicks Knocked Up and 27 Dresses opened at No. 1 earlier this year and Grey's Anatomy is one of the top shows on television. She's won one Screen Actors Guild award and been nominated for two Golden Globes.