OK, I know this is a day early but you have to start early on stuff like this around here

I can't believe your going to be 18 WOW! Time sure flies by when your having fun! I'm really glad to have made such a good friend here as you and I will always cherish your friendship. You've been there when I've needed a shoulder to lean on...literally.
I wish you the most happiest birthday ever and know it's going to be fun especially since your still at Amy's. I hope you guys have a great celebration for your birthday and Thanksgiving!

Dear friend...

HAPPY 18TH BIRTHDAY!!!