Jessica Simpson and Eric Johnson have been spotted in the crowd at Jessica's sister Ashlee's Las Vegas show. The two were seen together at Voltaire, a popular nightclub in The Venetian Resort, chatting with a group of people before the concert. Eagle-eyed fans spotted the pair, with Johnson wearing the same Georgia Institute of Technology cap he'd been sporting when he and Simpson got off a plane in Vegas on Friday. In photos published by multiple outlets, including TMZ and Page Six, the former couple were seen boarding the Southwest Airlines flight from Hollywood to Las Vegas. The pics showed Simpson and Johnson sitting in the same row during the flight with a middle seat left empty between them. Simpson and Johnson announced their separation in January, although multiple sources reported they had been living apart for several months before that. "Eric and I have been living separately, navigating a painful situation in our marriage," Simpson told Us Weekly in a statement on 13 January. "Our children come first, and we are focusing on what is best for them. We are grateful for all of the love and support that has been coming our way, and appreciate privacy right now as we work through this as a family." The pair are parents to three children aged 13, 12 and six.