When you write to an address and receive an autograph back it is always exciting, but you also have a little slither of doubt whether it is a genuine autograph or whether a personal assistant signed it

I would like to try and get Mila Kunis to sign an in-person autograph. What would be the best way to go about this? How can I find out if she is going to be attending any red carpet events or movie premiers?
If it proves too difficult then what address could I write to? For example, if it was announced that she was going to be on the Jonothan Ross show or something the following week as a guest then could I write to Mila c/o the Jonothan Ross show?
Any advice? Thanks
