[Your letterhead, if desired; if not, your return address]
[Date of letter-month, day, and year]
[Recipient's first and last names]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
My Valentine, my knight in shining armor-you are that and so, so much more. I feel so special to be your wife and to share my life with you. You are everything I always dreamed of, ever since I was a little girl-strong, handsome, sweet, tender, smart, and wise. Our relationship just gets better and better every day, and I love that. Happy Valentine's Day to my one and only. Thank you for your love not just on this day but every day throughout the year.
[Sender's first and last names]