My fiancé and I are graduating college in December and getting married next March. We're planning on inviting our favorite professor (who just got married for the first time this month). While she has been "Dr. Brown" the entire time we've known her, she's keeping her maiden name professionally, but will be changing it legally (and perhaps socially).
How would I formally address her and her husband's invitation?
Dr. Brown and Mr. Smith? Or Mr. and Dr. Smith? Or Mr. and Mrs. Smith?
Common sense tells me maybe the first option, but I just would like to know what other people might know.
Thank you for any advice!