What's happening on The Big Bang Theory?

Looks like the boys are getting a hot new neighbor upstairs, and Penny is none too thrilled about it! Valerie Azlynn, a familiar face from appearances on fellow CBS shows The Ex List, Cold Case and Rules of Engagement, is moving in, and the guys are instantly smitten. But Kaley Cuoco (Penny) tells me there's more to her than meets the eye. "Penny's not thrilled at first because the guys are ignoring her, but there's a little bit of a shift in the story where she knows something is off with this girl, and she ends up being right." There's really only room on the show for one hot girl anyway!