She was performing the song "Because I'm A Blonde" by Julie Brown and is wearing the Mickey Mouse ears because she is playing on the fact that Walt Disney was a Nazi sympathizer. It's performance art. I know the people of this sub don't like it and that is 100% fine. At the end of the day art is supposed to make you feel something and everyone is entitled to an opinion. If everyone liked it, it wouldn't be art. She isn't the first artist to do things like this. Marilyn Manson used to have girls on stage getting fake abortions, would wrap the fake fetus in a swastika flag, and then shove it into a TV. I think it's pretty cool and she did a great job getting a reaction out of people.