Probably because she was with Lancel. Cersei is very good at keeping her emotions in check and not giving anything away; if she'd been alone when she learned about Jaime, I suspect her reaction would have been very different.Edit to add: It seems I totally blanked on the fact that we actually did see Cersei's initial reaction to learning that in the scene with Lancel. That reaction was way too muted!


I mentioned it to try to avoid the type of atmospherre that you don't seem to mind here. And I'd have forgotten about it by now if it hadn't been for your dismissive attitude, and for what I thought that meant for viewers next season who wanted to discuss the show free from spoilers (Which they SHOULD be able to do here, and I don't think your argument that the rights of posters to discuss future events in this thread rather than in the spoiler thread should trump the rights of wierers who want to discuss *a TV show* without being spoiled holds water).