Fans supported Billie Eilish through her Electric Picnic gig after she complained of feeling “really, really sick” before her performance.The US superstar, 21, headlined the first day of the Irish event at the Stradbally Estate, Co Laois, on Friday. Social media videos showed her delivering her Barbie soundtrack hit What Was I Made For? in a white Nike shirt and baseball cap. She was joined by the crowd who sang along to songs including Happier Than Ever.