Gene Simmons -- Honors MJ at Michael Jackson Tribute Concert

Pretty ironic -- Gene Simmons, who called Michael Jackson a hard-core pedophile, will perform at the MJ Tribute Concert.

Katherine Jackson was on CNN this AM, talking about the concert, when promoters revealed that KISS would be performing.

Yet Gene Simmons went on record last year -- mind you, a year after MJ died -- saying, "There is no question in my mind he molested those kids. Not a doubt."

Simmons went on to say, "The only sexual references ever made about Michael Jackson that were made by anyone, anywhere around the world, have always been made by kids, and specifically males usually 10 to 14 years of age; never females, that age or older, and never grown men."