Dolly Parton has postponed her first Las Vegas residency in 32 years due to "health challenges." The country music icon, 79, announced the news in a post on Instagram on Sept. 28, telling fans that she wanted them "to hear directly from me that, unfortunately, I will need to postpone my upcoming Las Vegas concerts.""As many of you know, I've been dealing with some health challenges, and my doctors tell me that I must have a few procedures. As I joked with them, it must be time for my 100,000-mile check-up, although it's not the usual trip to see my plastic surgeon!" she wrote.