December 26, 2016 09:04 AM

Andrew Ridgeley penned a heartbreaking tribute to his late Wham! bandmate George Michael.

“Heartbroken at the loss of my beloved friend Yog. Me, his loved ones, his friends, the world of music, the world at large. 4ever loved. A xx,” Ridgeley, 53, tweeted on Sunday.

Michael died of heart failure and was found in his home on Christmas Day, his rep confirmed to PEOPLE. He was 53. Michael’s publicist confirmed that the iconic singer passed away “peacefully.”

RELATED LINK: From Wham! to Solo Success: George Michael’s Life in Photos

Ridgeley sent out another tribute to his “beloved friend” hours later, sharing a quote from Michael: “I still believe that music is one of the greatest gifts that God gave to man.”

Michael Putland/Getty

In his own tweet, Ridgeley responded: “God didn’t give it, you did my old friend. Cleft with grief. A xx”

Shirlie Kemp and Helen “Pepsi” DeMacque, who formed the duo Shirlie & Pepsi after providing background vocals for Wham!, remembered the singer with their own social media posts.

Peter Still/Redferns

Kemp recalled the last time she saw Michael, writing in a tweet, “only last week I saw him laughing and happy.”

“My heart is broken to loose someone so special,” she continued.

Meanwhile, DeMacque tweeted: “Broken by the lost of my friend my brother a major part of my life never forgotten I have amazing memories to hold close to my heart RIP.”

Michael, born Georgios Kyriacos Panayiotou, launched his decades-long music career in the 1980s as a band member of Wham! He later went solo with his 1987 album, Faith.

During his almost 40 years of fame, Michael sold 100 million albums worldwide.

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