Mad Men's John Slattery Joins the Cast of Arrested Development

The Bluth family may be getting even bigger!

Mad Men's John Slattery has landed a multi-episode arc on Arrested Development, TVLine.com reports.

Details on Slattery's role are being kept under wraps, but we're hoping the silver fox plays a new love interest for Lucille (Jessica Walter), or maybe even Lindsay's (Portia de Rossi) biological father.

The Bluths are back! See new Arrested Development photos

Arrested Development began shooting its fourth season last week. The series last aired in 2006 on Fox. The fourth season will include 10 episodes, each focused on a different member of the Bluth family. All will be made available simultaneously on Netflix sometime in 2013.

Who do you think Slattery is playing?