We can see Gaga smiling and clapping her hands at 0:22 and this is the reaction RIGHT after he won, then she was talking to Diane not caring about Sam going to the stage at 0:28 and the reaction which we all saw (0:55) was when he mentioned her in his speech.
I think she was happy for him and surprised at the same time. We can see Diane and that woman sitting next to her (is that Catherine Hardewick?) are very di
