How to address wedding invitation to pastor and wife?

I just looked this one up myself. The correct way to address it is:

Pastor Steven White and Mrs. Ellen White"

And, if you have their home address, that is where you should send it.

So address his wife as Mrs. even though she is also a pastor?

Per Emily Post:

http://www.emilypost.com/forms-of-address/titles/113-addressing-husband-and-wife-ministers

When addressing a letter to a husband and wife who are both ministers and are both referred to as "Reverend," how should they be addressed? Does the wife's name come first?

The appropriate way to address a letter to a husband and wife who are both ministers is: The Reverends Mary and John Smith. The wife’s name always comes first.