Benedict Before The Guadalupe Image

From the year he became Pope:

Holy Mary, who under the title of Our Lady of Guadalupe are invoked as Mother by the men and women of Mexico and of Latin America, encouraged by the love that you inspire in us, we once again place our life in your motherly hands.
May you, who are present in these Vatican Gardens, hold sway in the hearts of all the mothers of the world and in our own heart. With great hope, we turn to you and trust in you.
Hail Mary, full of grace,
the Lord is with thee,
blessed art thou among women and blessed is the fruit of thy womb, Jesus.
Holy Mary, Mother of God,
pray for us sinners,
now and at the hour of our death. Amen.
Our Lady of Guadalupe,
Pray for us.

Here's a book he wrote on Mary (with von Balthasar) from before he was Pope. Here's a collection of his Marian work from after he became Pope.