Kate Hudson has taken a sly swipe at Hollywood rival Katherine Heigl – by pretending not to know who she is.

Katherine is undoubtedly one of the biggest new stars of the past year, thanks to roles in Knocked Up and, most recently, romantic comedy 27 Dresses.

But, when asked what she thought of the current darling of the box office, Kate feigned ignorance.

She told Elle magazine, "Who is she?... Oh, that girl in 27 Dresses? I just don't think about that stuff."

How rude!