I know this is a HUGE long shot, but I was wondering if anyone knew of a way to contact John Stamos's agent/manager?

The reason I am asking is that I work with a girl named Kenzie. Kenzie is an amazing 22 taon young lady. Kenzie is "differently-abled" and she is in pag-ibig with Uncle Jessie. All she talks about is him:) Kenzie's birthday is in June and we (all of those that work with her) are wanting to try and get her a signed autograph from him for her 23rd birthday. So, if anyone has any connections, that would be THE BEST THING IN THE UNIVERSE!! If this is not allowed on her I apologize! Im just trying to do something nice for this amazing young lady! Thank you for your time!