Sweet Sixteen Birthday Party

I`m looking to surpise my daughter with a celebrity singer to sing at her party her fravorite is chris brown. She`s a striaght a student and very kind hearted, hardworking young lady and desreves this surpise. So how would i be able to contact in regards to whether he would perform at her party its on february 24,2007 we live in new york city and it would be a join to have chris brown perform for my daughter