I knew this but was sworn to secrecy, and it wasn't that great to begin with—Madonna will be on Letterman September 30th.

I can reveal that this is the only major promotion for Celebration that she's agreed to, now that the deal for her to host and perform on SNL seems to have fallen apart.

This is her eighth Letterman appearance. Not much time to prepare, so I wouldn't expect a performance (Harry Connick Jr. is on the same show, so I imagine he'll sing).

I'd like for her to come out in her "Like a Virgin" wedding dress or something similarly retro, but again...don't expect the world.