You address a count and countess in an invitation as: (example) Count John Doe and Countess Jane Doe. If the names are different because of their culture it may be: Count Raoul Sanchez and Countess...
A "Count" is the equivalent of an English Earl in the ranks of nobility, two "steps" below that of a Duke (feminine: Duchess).
The title of Count was often conferred by a monarch as an honorific...