Celebrity couple Seal and Heidi Klum have called off their annual wedding vow renewal ceremony because of the international swine flu pandemic.

The crooner and his supermodel wife were planning to celebrate their fourth anniversary in Costa Careyes, Mexico later this month, but decided to cancel their ceremony to protect their health — as well as that of their guests.

A source tells Life & Style Magazine, “Heidi was worried about border closings and her three small children – and, of course, she’s pregnant.”

The couple recently revealed that they are expecting their fourth child.