But now it's straight up cancelled!
Ticket holders were sent the following email on Friday:
[Image via Fayesvision/WENN.]
Ch-ch-check out the video (above) to find out where Johnny got his rock- and what he thinks of fiancé Amber Heard's family!
And take a gander at the pics (below) to see Johnny looking hot as ever for what may well be his last appearance on the Late Show.