"madame"
Traditionally, in French a young or unmarried lady is referred to as "mademoiselle". A woman or married lady is referred to as "Madame".
When you don't know about the marital status of a French woman, you can write to her "madame". She won't be offended. Anyway there is no real equivalent to 'Ms' in French.
Frau
Mrs. is a title of respect that may be used to address a married woman. Ms. is preferable, especially if you do not know what the woman's preferred title is, or if you do not know the marital status of the woman.
Frau
Unless the woman specifies otherwise, always address correspondence to Ms.
You can address an unmarried woman as "Ms." just as well as a married woman. In a situation where you are unsure of the marital status, "Ms." is a safe form of address, and avoid "Miss" and "Mrs."
A single woman is addressed as "Mademoiselle" in French, which means "Miss". It is the equivalent of addressing an unmarried woman in English as "Miss". However, in recent years, the use of "Mademoiselle" has become less common, and many French speakers now simply use "Madame" (Mrs.) for all adult women.
The prefix "Mme" is short for "Madame," a French honorific used to address a married or older woman. It is equivalent to "Mrs." in English.
The way to address a shower invitation to a married women would be you address them by their full married name. Example: Mrs. Kate Bolton.Another PerspectiveThe best way to address a shower invitation to any woman is to simply use her name. This is the twenty first century. A shower invitation does not need to reflect a woman's marital status.To: Kate Bolton.
Yes, he is ! He is married to a French woman who teaches philosophy at Lycee Louis le Grand !