Music mogul Simon Cowell is facing a High Court challenge in London over a multimillion-dollar business agreement that was reportedly first scribbled down on a napkin, according to newly filed court documents. Today's top videos STORY CONTINUES BELOWRosenblatt is seeking a percentage of a confidential deal struck in 2025, or alternatively £100,000 in damages for breach of contract. Ratcliffe told the court that the terms were jotted down on a napkin, which Cowell then signed. Rosenblatt claims that when he invoiced Cowell over a deal completed in 2025, the fee went unpaid. It remains to be seen how Cowell will respond to the claim now that proceedings have been formally lodged at the High Court.