YOU SAID:
You're the prettiest person on earth
INTO JAPANESE
あなたは地球上で最もかわいい人です
BACK INTO ENGLISH
You are the cutest person on the planet
INTO JAPANESE
あなたは地球上で最もかわいい人です
BACK INTO ENGLISH
You are the cutest person on the planet
That didn't even make that much sense in English.