Kelly Osbourne is mourning the loss of her father Ozzy following his death on Tuesday. Osbourne posted a brief message to her Instagram stories on Thursday afternoon. “I feel unhappy I am so sad,” she wrote. “I lost the best friend I ever had.”

Ozzy Osbourne spent time with his daughter, Kelly, and his grandson, Sidney, in a video shared just two days before the rocker's death at 76 on Tuesday, July 22.

They were just totally in love and devoted to each other, and that wasn’t for the cameras. That was just who they were.”

Ozzy Osbourne welcomed two children with his ex-wife Thelma Riley and three children with Sharon Osbourne. He also adopted Thelma's son from a previous relationship. Here's everything to know about Ozzy Osbourne's kids.

Legendary Black Sabbath singer Ozzy Osbourne has died at 76 after battling Parkinson's and performing his final concert weeks ago