By Wendy Mitchell
December 24, 2009 at 04:15 PM EST

With It’s Complicated opening on Christmas Day, Alec Baldwin stopped by The Late Show with David Letterman last night and even had Dave cracking up. The conversation about his butt double “dining out all around New York” was just one of many highlights.

Here’s a clip of Baldwin talking about meeting Burt Lancaster in an elevator:

What was your favorite moment from Baldwin on Letterman? Is there any better talk show guest than Alec Baldwin? Who’s lining up already for It’s Complicated?