Elton John is mourning the loss of his good friend, George Michael.
The 69-year-old singer opened his Las Vegas show on Wednesday with a performance of his hit, "Don't Let the Sun Go Down on Me." The two superstars memorably sang the song together in a live cover version in 1991, which reached number one in both the U.K. and the U.S.
John sang the ballad as a picture of Michael was projected in the background.
"After he sang for George, he turned his back on the audience and was shaking and looked like he was crying," an eyewitness also tells the outlet. "He received a standing ovation and had to be consoled by a band member before beginning the rest of the show. There wasn't a dry eye in the house."
Check out their original performance of the heartfelt tune below:
On Monday, John tweeted about Michael's death. "I am in deep shock," he wrote. "I have lost a beloved friend -- the kindest, most generous soul and a brilliant artist. RIP @GeorgeMichael."