In Season 5, Pete Campbell (Vincent Kartheiser) strayed outside his marriage with troubled housewife Beth Dawes, played by none other than "Gilmore Girls" alum Alexis Bledel. The affair didn't end well — Beth ended up in the loony bin, actually — but the pairing certainly clicked in real life: Kartheiser and Bledel are now married.
The halls of Sterling Cooper & Partners have been filled with a lot of familiar faces lately. Here are more than 20 "Mad Men" guest stars we recognize from previous roles in TV and movies. — Dave Nemetz, Yahoo! TV