Pop superstar Beyoncé is currently in the midst of a world tour called “The Mrs. Carter Show.” Despite the fact that an unnamed source close to her and her husband, Jay-Z, has denied it, rumors of the singer being pregnant are beginning to persist. The couple already have one child, a one-year-old daughter named Blue Ivy.

Now, Beyoncé’s health is once again in the spotlight as her tour hits a snag. The singer was scheduled to go on stage tonight in Antwerp, Belgium, but has cancelled the show. According to an Associated Press report, the show was cancelled due to the singer’s “dehydration and exhaustion.” She has reportedly been ordered by doctors to get some rest.

The cancellation was announced via Beyoncé’s Facebook page, where ticket-holders were encouraged to hold on to their tickets for a rescheduled show:

Beyoncé’s world tour is scheduled to hit much of Europe for the rest of May before continuing on to cities in the U.S. and Canada throughout June and July. The singer’s statement to the AP made it clear she is waiting for Doctors’ advice before continuing on with the tour.