"We are thrilled about the good news and can hardly wait to have a bigger family," the couple, who wed in 2002, said in a statement.
The supermodel, 39, is due in May. The baby will join siblings Clementine, 5, and Caspar, 7 this month.
updated 01/15/2010 at 01:25 PM EST
•originally published 01/15/2010 01:45PM