Miley Cyrus has performed a new cover of Cocteau Twins‘ ‘Heaven Or Las Vegas’ in the city itself – watch footage below.The cover came as part of a special show opening the new Resorts World venue, where she also joined calls to “free Britney” while performing ‘Party In The USA’.“I’m gonna sing a song that no one fuckin’ knows,” Cyrus joked before beginning the cover. “But you will know it after tonight.“I’ve seen the tweets: ‘Stop doing covers!'” she added.