Under doctor's orders, Simpson was forced to cancel dates on Today, Total Request Live and The Late Show with David Letterman. Instead, the In This Skin singer flew to New York a day earlier than planned and met with a voice specialist.
"She's on total vocal rest and some of her appearances have been delayed," Simpson's rep, Rob Shuter, confirmed.
A friend of the Teen Choice Award winner for Movie Breakout told In Touch that Simpson, who's been communicating with people via notepad and pen, was feeling physically okay but was bummed about the bad timing.