We all know what question Desperate Housewives will focus on when it returns from a holiday hiatus on January 2: Who shot Paul Young?

But there's another issue that will also be settled, one with which viewers are already familiar: Who slept with Tom?

Lynette will learn the unfortunate answer on Sunday's "Assassins," as the following clips depicts a conversation that doesn't go very well for this housewife. Watch her reaction to Renee's admission now:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.