Conan O'Brien is stopping by The Late Show with David Letterman next week to make his first appearance in 13 years!

The last time he was interviewed by the CBS late night favorite was in 1999, and A LOT has changed since then.

Yeah, we know. Understatement.

Between Conan getting promoted Jay Leno since Letterman (who once hosted Late Night on NBC) lost the Tonight Show gig to the comedian too.

Conan doesn't seem to hold back on the Leno jokes when the opportunity arises, so we have a feeling it will come up in some form or another.

We doubt Leno will be the focus of the interview, but wouldn't mind if it was. Obviously, we love our celebrity gossip!

[Image via WENN.]