Celine Dion gets an order to rest.br br The singer's doctor has prescribed six to eight weeks of vocal rest after being diagnosed with weakness in her right vocal cord.br br Forcing her to cancel a series of performances at Caesars Palace in Las Vegas.br br On her official Website the singer apologized to fans and promised to come back better than ever.br br Dion's next run of performances is scheduled for June 9th to August 19th.br br Alicia Powell, Reuters.