KISS star Gene Simmons has had a medical procedure at a Los Angeles hospital.
The 70-year-old bassist and co-lead singer is having several kidney stones removed 'early Tuesday morning', according to TMZ.
The non-invasive procedure used to aid the process 'only took about an hour to complete' say the gossip site's sources.
Hospitalized: KISS star Gene Simmons has had a medical procedure to remove kidney stones performed at a Los Angeles hospital. Simmons seen here last month
And it's not the first time the Israeli rocker has passed the irritating stones.
Back in 2009, Simmons had a similar medical issue, before turning his misfortune into a good cause by auctioning off the offending item and donating the proceeds to charity.
'I passed a kidney stone and I put it on eBay for charity. (I got) $15,000,' the Daily Express quoted the singer as saying at the time.
Rock on! Gene Simmons, 70, seen here at a Cincinnati KISS show back in August
They're in the middle of their End Of The Road world tour, which the rock band has said will be their final concert tour.
But an emergency 'medical procedure,' is putting the tour on hold, at least for their Salt Lake City, Utah show on Saturday night.
KISS's bassist and singer, Gene Simmons, 70, took to Twitter on Monday to make the announcement, saying it's '[n]othing serious. But it must be taken care of now.'
On hold: KISS's bassist and singer, Gene Simmons (left), took to Twitter on Monday announce their Salt Lake City show will be postponed, citing an emergency medical procedure (pictured with Tommy Thayer, right, in Mexico on May 3)
'Apologies to the fans in Salt Lake City. We will come back and do the show at a later date,' Simmons wrote.
'The truth is, I have to fly to LA to do a medical procedure. Nothing