I have a feeling that the media guys at Livenation are never going to want to work with us, because of some of the disturbing comments by some grown men on here.
(Sorry, I have no smart arse remark to counter that one...)
I saw her Vegas show last year and while it was spectacular (amazing effects, great choreography from the dance troupe etc) the gal only sang one song live - 'Everytime' - and was struggling to manage that. Britney's dancing was also... hard work for her.
Go for the party but don't expect any engagement from her - there was one "Are you ready to party?" and a "Goodnight - this was fun!!".