Can't be mad about this: The low-key Mad Men costars tied the knotvery quietly in California in June, PEOPLE confirms. The two got engaged in March 2013, after Kartheiser hilariously practiced his proposal on his cast mates. But seriously, "They are such a yin and yang," Mad Men's Elisabeth Moss told PEOPLE. "I've known Vinny for 12 years and Alexis is just the sweetest. I've never seen Vincent like this. It is really cool."