Announcing married couple

From the entry Mrs in Wikipedia:

Mrs. was most often used by women when married, in conjunction with her husband's first and last names (e.g., Mrs. John Smith). A widow was and still is addressed with the same title as when she was married. Mrs. was rarely used before a woman's first name, maiden name, or before a hyphenated surname her husband was not using. For example, Mrs. Jane Miller (wife of John Smith), Mrs. Jane Smith, or Mrs. Jane Miller-Smith were considered incorrect by many etiquette writers, especially of the early 20th century.[3]

It is now less common for a woman to be addressed using her husband's first name, except when the couple is being addressed jointly, such as in Mr. and Mrs. John Smith.

That introduction is in common enough use in the US that no one will be confused. However, some people (usually younger) will actually take offense. Couples my age (early twenties) frequently see the practice as being somewhat derogatory since the woman is being identified only as the wife of her husband instead of by her own name.