Sometimes it's easy to assume that all famous people know each other. But until Saturday's (July 5) Back to the Beginning blow-out final show honoring Ozzy Osbourne and Black Sabbath, the Prince of Darkness had never met Guns N' Roses singer Axl Ros e. Despite both men being hard rock royalty, their paths had somehow never crossed.

On July 5, Ozzy performed his final concert — titled “Back to the Beginning” — with his band Black Sabbath. It was the first time the singer had reunited with the group in 20 years.

Kelly Osbourne, daughter of rock legend Ozzy Osbourne, is now engaged to Slipknot turntablist and keyboard player Sid Wilson. The TV personality shared a video to her Instagram on Sunday of Wilson popping the question backstage at her father's final show with his pioneering heavy metal band, Black Sabbath.