Beyonce has cancelled her concert in Belgium tonight. The "Grown Woman" singer was due to take the stage at the Sportpaleis arena in Antwerp this evening for the latest date on her Mrs. Carter Show World Tour, but she has pulled out of the gig citing dehydration and exhaustion.

The 31-year-old star - who began her tour in Serbia last month - will not be able to perform and is under strict doctor's orders to rest, her publicist has confirmed. The concert will be rescheduled and Belgian fans who were eager to see the singer perform will have their tickets honored at a later date.

A second show due to take place at the same venue tomorrow night is now also in doubt, with the publicist stating that Beyonce "is awaiting word from her doctors before making a decision."

Rumors began circulating earlier this week that Beyonce is expecting her second child following her appearance at the Met Ball in New York City last week, where the star's alleged pregnancy was the talk of the night amongst the A-list crowd.