Kelly Osbourne publicly acknowledged Thursday Ozzy Osbourne’s death with a an emotional tribute.

The heavy metal icon, and the face of Black Sabbath, died at 76 “surrounded by love,” it was announced Tuesday.

Two days later, his daughter Kelly Osbourne posted lyrics from the Black Sabbath song “Changes,” which she and Ozzy Osbourne recorded as a duet together in 2003.

“I feel unhappy I am so sad,” Kelly, 40, posted Thursday on Instagram. “I lost the best friend I ever had.”

“Changes,” which Ozzy co-wrote, was first released by Black Sabbath in 1972.

In 2003, he and Kelly Osbourne recorded a version as a duet with revised lyrics.

The song was a No. 1 hit in the U.K., and they became just the second father-daughter pair to top the charts, after Frank and Nancy Sinatra in 1967.

Mark Heim is a reporter for The Alabama Media Group. Follow him on Twitter @Mark_Heim. He can be heard on “The Opening Kickoff” on WNSP-FM 105.5 FM in Mobile or on the free Sound of Mobile App from 6 to 9 a.m. daily.