I have seen her perform at several Scientology events.
A few weeks ago she performed at the Maiden Voyage Event on L. Ron Hubbard Way (she performed before the video briefing by David Miscavige). She did about five numbers. There were about 5,000 people there and she had us all on our feet, screaming our heads off in a standing ovation.
I also saw her at the Citizens Commission on Human Rights annual fundraising dinner this past February and at the Celebrity Centre Gala last August.
And it's always an amazing experience to hear her perform.