Seth, 39, met lawyer Alexi at a wedding several years ago. (See a photo of them together here.) An insider told Us that Seth has known Alexi was "The One" for a while, but the timing had to be right for an engagement/wedding.
Seth is poised to take over Late Night from Jimmy Fallon, who is replacing Jay Leno on The Tonight Show in 2014. "With Late Night, his schedule will be slowly easing up," the source said. "He wanted to do it after SNL wrapped [because] he didn't want to be an absentee fiance. Her family loves him."
Seth isn't quite done with SNL yet. He'll reportedly stay on as the head writer through the fall. But how exciting is his life right now? A great new job, an engagement. The future’s so bright. But we hope, for Alexi's sake, that Stefon does not crash the wedding. You had your shot, man!