Here's the breakdown:
* Mon means "my" in French.
* Chérie is the feminine form of "chéri," meaning "darling" or "sweetheart."
* Mes is the plural form of "mon."
* Chéri(e)s is the plural form of "chérie" and can be used for both masculine and feminine forms.
Therefore, the plural form of "mon chérie" is mes chéri(e)s, which means "my darlings" or "my sweethearts."