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Katherine and her boyfriends (including BFF/Grey's co-star T.R. Knight) were spotted at the Arclight in Hollywood on Sunday, and we're not sure if they caught a screening of Kat's latest flick, but we're hoping they went to celebrate afterwards!

The Ugly Truth raked in $27 million this weekend, coming in third place behind Harry Potter ($30 million this weekend, $627.1 million internationally!) and Disney’s G-Force ($32.3 million). Not bad!

Now, about Grey's Anatomy...