Oh Snap: Exclamation. Typically used as a third party reaction to a killer burn.

Kate Hudson on Katherine Heigl:

"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.”

Nicely done, Kate. Very nicely done.

In related news: Kate Hudson decidedly not pregnant, at the beach with Mini-Chris Robinson.