The statement 'Tu es la plus belle' means You're the most beautiful. In the word-by-word translation, the personal pronoun 'tu' means 'you'. The verb 'es' means '[you] are'. The definite article 'la'...
To me you are the most beautiful
we think of you - you are unique for me
So you are there, my beautiful (girl)(?) Then thou art my Beautiful
"Tu": too "est": ay"tout": too"pour": poor"moi": mwah