How to chat with celebrities online?

I am a HUUGEE fan of 2 stars. 1 from Hollywood and 1 from Bollywood(Indian film industry). David Bowie and Shah Rukh Khan. I would LOVE to be able to chat with them. If anyone knows their e-mail address or any way of chatting with them...PLEASE HELP!! I will not misuse any of the information...PLEASEEEE...I beg anyone who has any information to HELP. PLEASE!