Here's a breakdown:
* Lucienne: This is a proper noun, a name.
* je: This is the French pronoun for "I".
* ma: This is the feminine possessive adjective meaning "my".
* chérie: This is the feminine form of "chéri," which means "darling" or "sweetheart."
Therefore, the entire phrase translates to "You are my darling, Lucienne."
This phrase is often used in a romantic context, expressing love and affection.