I think you are sweet french
In French, you would say "Je pense que tu es mignon(ne)" to mean "I think you're sweet."
The French translation of "she is sweet" is "elle est douce."
Sweet sixteen is not an expression that translates into French. It is an English idiom.
In French, to say "Sweet Prince", you can say "doux prince" or, if sweet means candies, "prince de bonbons", but I think you wanted to know the first.
sa sobrang sweet baka langgamin
The French translation of "sweet events" is événements douces"".
Bon Nuit mon amour. (I think... maybe "M'amour" for gender reasons)
Il est doux.
comme c'est doux!
dessert on douceur
Simplement doux
douleur douce