Maybe she wasn't feeling good? Maybe she had trouble with someone? Maybe she was just exhausted from flying around the world? Who knows what was going on. Plus, she doesn't have to jump around the entire concert like Miley and Selena would do and you see her dancing on some pictures. Let her enjoy the concert the way she wants to.
There are pics of her dancing, cheering and having a good time. Why are people seriously just focused on these? Maybe she's having relationship trouble with John and can't relate to the song or she's had a long day....the fact that she tweeted about it and took the time to see her shows that she knows what she was looking forward to and Brit has got her attention. There is no disgusting expression in any of those pics or a grin of mockery so trying to start **** out of these pics is ridiculous and just shows how thirsty ATRL is when it's slow news day.
That's exactly the same face I had at some parts of Beyonce's show. I mean, I enjoyed the concert but I'm not a big fan, so I won't be jumping and dancing to every song. I don't know why you think Katy can't be in that same situation