romanticbeginneruniversal
Du bist wunderschön.
/duː bɪst ˈvʊndɐˌʃøːn/
You're beautiful.
Literal translation
You are wonderfully-beautiful.
When to use it
Stronger than 'schön' — 'wunderschön' is breathtaking-level beautiful.
In conversation
—In diesem Kleid bist du einfach wunderschön.
“—In that dress you're just stunning.”