(Cover) - EN Showbiz - Gene Simmons is going to be performing at the upcoming Michael Jackson tribute concert despite questioning his relationship with young boys.

The KISS frontman will be among many celebrity guests to perform at the concert in honour of the King of Pop, it was announced today.

Michael's mother Katherine Jackson told CNN this morning that the rock star will on stage in Wales for the October concert.

But Gene has been vocal about his views on Michael's relationships with young boys and last year said he believed his behaviour was untoward, TMZ are reporting.

"There is no question in my mind he molested those kids. Not a doubt," he said.

"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." (C) Cover Media