Earlier this week we took a look back at some of David Letterman's more interesting (and shirtless) moments prior to his 30th year anniversary in late night television. Letterman is now the longest-serving host in late-night TV history. That milestone was reached last night, and the host celebrated on-air with his pal Howard Stern, who says he's the only one still fighting the late night war. Watch below as the two talk about Jay Leno, complete with an impersonation from Letterman himself.

Here's the "Top Ten Things Staffers Would Like to Say to Dave on his 30th Anniversary in Late Night."

And here's a more somber moment from the host, during his first post-9/11 show: