TMZ are reporting that KISS bassist/singer, Gene Simmons, was admitted to a Los Angeles hospital, and underwent a kidney stone procedure.

Says TMZ: "Gene Simmons is on a break from rockin' and rollin' all night to deal with some pesky kidney stones - and he underwent a procedure this week to nip it in the bud. Sources close to the KISS singer tell TMZ that Gene was admitted into Cedars-Sinai Hospital early Tuesday morning to undergo a medical procedure that should help get rid of the stones. It's non-invasive, we're told, and only took about an hour to complete.

"Our sources say a stent was inserted in his urethra, which helps urine flow from the kidney to the bladder... ultimately forcing the stones to pass through. Sounds like he'll be peeing 'em out soon. We're told the stent will be removed in about a week - and any remaining stones will be removed too. Gene should be good to go at that point.

"It sounds like he's been ramping up for this procedure for at least a few weeks now - Gene tweeted to fans on Sept. 13 that he and the band would be putting their farewell tour on pause so he could handle his health issues. But, he assured them it was no biggie.

"Here's the kicker... back in 2009, Gene sold one of his kidney stones for $15,000, which ended up going to charity. If things go well here... he might have a bundle on his hands. Any bidders out there?"

KISS are scheduled to perform next on November 16 at RAC Arena in Perth, WA. Find the band's End Of The Road tour itinerary here.