PHILADELPHIA (CBS) — She was chatting it up with Bill Clinton at Philly’s Made In America festival over the weekend, but Beyoncé now has to keep her mouth shut — doctor’s orders. That means no concert tomorrow in North Jersey. But what about her stop later this month at the Linc?

Some fans might be miffed at the MetLife show’s postponement to October 7th, considering Beyoncé was photographed partying well into the early morning hours at her ‘Soul Train’-themed 35th birthday in New York City. E! News reports she ‘addressed’ the guests, thanking them for celebrating with her.

But in a news release before that bash, Live Nation and Beyoncé’s management noted a physician’s ‘strict’ prescription for vocal rest as the reason for the rescheduling.

The concert promoter says the Formation tour is expected to resume on Saturday in St Louis, with Beyoncé still scheduled to perform in South Philly on the 29th.