How do you say I am beautiful in french?

If you are speaking to a man then it would be:

You are beautiful (to a stranger) - Vous êtes beau

You are beautiful (to a friend) - Tu es beau

If you are speaking to a woman then it would be:

You are beautiful (to a stranger) - Vous êtes belle

You are beautiful (to a friend) - Tu es belle

If you want to emphasise it then you can also use the Word très (very) before the Words belle and beau.