The pair were teammates at Barcelona as junior players.
Arteta told the Daily Express: "I would have, but we couldn't match Liverpool's offer. He was the best man at my wedding along with Tim Cahill. I can't remember his speech because it was so late at night."
Reina signed in 2005 and he revealed: "It was in the February and Rafa [Benitez] was knocking at my door already and it was a possibility for me to come from Villarreal. Mikel had joined in the January and I asked if it was a good place."