Firstly it would have to be sound proof then:
A very large dressing table holding all the make up. perfumes and creams I would want.
A sound system which has settings for different occasions
A huge walk-in warcrobe with rows of lovely clothes and an abundance of shoooooooooooes!!
Big mirrors....not for vanity reasons but purely because you need proper full length ones to make sure your outfit is right....well its a bit vain but ah well it's my room
A huge TV for when XFactor and the likes is on coz I'm always missing it when I'm getting ready to go out
A well stocked bar
A laptop
And nice sofas for my mates to chill out on when they come round to get ready in my lovely room!