How would I be able to send a fan letter to Keanu Reeves?

I am a huge fan of The Matrix. I want to send a fan letter to Keanu Reeves, but I don't know how. I know he probably gets tons of letters, but I still want to try and send one. How would someone send a fan letter? I have seen The Matrix, The Matrix reloaded, The Matrix revolutions, Speed, The day the earth stood still (newer version), and only bits and pieces of point break. Star this is your a Keanu Reeves fan!