[Bells]

She probably does it only when she's nervous, which she obviously will be a lot in somewhere like the BB house. When Anthony had his date, she kept sucking her thumb - so obviously she was really jealous, but I do find the whole thing strange considering she has a boyfriend. I know of course that it's possible to like someone else when you're in a relationship, especially in a BB atmosphere, but Amy is someone who's been handling the situation well. I may be getting confused in thinking Calista has a boyfriend: otherwise, I'm not sure why Anthony/Calista aren't together.