Madonna faces another lawsuit over alleged late concert starts and accusations of lip-syncing during her ‘Celebration Tour’ shows. Ticketholders in Washington D.C. claim she arrived on stage two hours late at gigs at the Capital One Arena, despite a scheduled start time of 8:30pm. The suit also alleges the arena was uncomfortably hot and that Madonna refused to lower the temperature. Additionally, the lawsuit accuses Madonna of lip-syncing parts of her performances, which the plaintiffs claim constitutes false advertising. Madonna and Live Nation have not yet responded to the new claims.