Gene Simmons paid tribute to the fellow rock icon. "Sad to report Ozzy has passed away. He was a giant. Admired and loved by millions of fans worldwide. Prayers and condolences go out to the Osborne family," the KISS rocker wrote, sharing a link to news of his death.

Celebrities and fellow musicians are reacting to the loss of a true rock legend. Ozzy Osbourne passed away on July 22 at 76 years old, and his band Black Sabbath was among the first to publicly honor his legacy with a simple but lasting message on their official social media accounts.