Frank Hardy and Nancy Drew are married, aka Mr. and Mrs. Logan.
Parker Stevenson was also one of the Hardy Boys while Pamela Sue Anderson played Nancy Drew in their own TV series. Might have appeared on each other's shows in the '70s.
Parker Stevenson and Pamela Sue Martin starred together in the 1974 movie Our Time.
Marina Sirtis played a similar royal secretary also looking out for a prince in "My Summer Prince."