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Wasn't the guy who whispered something in Katharine's ear that made her laugh the guy that was trying to pick up Rebecca Romijn earlier in the episode? The one who made the dollar bet on who could sleep with the hottest girl in the room? I think it was. And if that's the case...that's really cool. That he gave up on Rebecca after finding out that story and went for Katharine.
I notice he wasn't sitting next to her when you saw her two more times after that watching the fashion show. Must have shot him down. Go Kat Go!
Here's a cute (back-stage) video of Kat by Access Hollywood; sorry about the advert, but it's worth your trouble to see our very sweet but also "real cool" girl in action behind the scenes: video.accesshollywood.com/v/
Katharine McPhee fans around the world