Swedish House Mafia's Sebastian Ingrosso spilled the beans that the group has been working with Skrillex and Ellie Goulding on a track for Goulding's new album. Talking to Billboard, Sebastian revealed that the DJ and singer, who are a couple, made a demo and it was amazing. He continued that they had a blast...Ellie is a great artist...her voice is amazing and that Skrillex, is Skrillex, enough said. Skrillex recently revealed that he started dating Ellie after they sparked up an internet romance. Skrillex will headline this summer's South West Four. The DJ, who released his new EP 'Bangarang' in February, will headline the festival's closing night.