Can you send fan mail to Austin Butler?

I always wanted to send fan mail to some of my favorite bands or actors, but never really had the courage to because I thought it might be weird. Turns out people before the internet did that all the time. I just wanted to send a letter of appreciation and I might honestly try to do that for other celebrities I like! I am of course not trying to find his personal address or anything weird like that. I just wondered if anyone has sent fan mail to him or if there is an address to send fan mail to? Just wanted to write a letter, not ask for an autograph or send a package or gift or anything.