Pop megastar Taylor Swift was sued by a Las Vegas performer on Monday who said Swift’s latest hit album The Life of a Showgirl violates her trademark rights.Maren Wade said in the complaint that marketing for Swift’s album threatened to “drown out” her long-running Confessions of a Showgirl stage show and asked the court to block Swift from creating confusion with her album title.Representatives for Swift and her label Universal Music Group, also a defendant, did not immediately respond to...