How To Write A Letter To Famous Person . When you don't know the person's gender: Skip down a line and then include the date you wrote the letter. 11 Amazing Thank You Notes From Famous People Mental Floss from www.mentalfloss.com You can write about being the top of your class, awarded as the best team player, updates about your love life, a promotion at work, your plans and your dreams. To the person who has fallen in love with all your flaws along. Submit the letter in good time.