United Kingdom, July 7 -- Sid Wilson took inspiration from Kelly Osbourne's nickname when designing her engagement ring.

The Slipknot rocker proposed to his long-term partner - with whom he has two-year-old son Sidney - backstage at her dad Ozzy Osbourne's final Black Sabbath show in Birmingham, England, over the weekend, and it has now been revealed he played an "instrumental role" in creating the gold-and-diamond jewellery he presented the 40-year-old star with when he popped the question.

An announcement from jewellers Mouawad, who created the ring, explained: "Sid played an instrumental role in shaping the vision for the ring, sharing intimate details and inspiration that brought the design to life.

"At the heart of this creation i...