The model and her TV presenter hubby, who are expecting their first baby in April bought a three-bedroomed house in Newcastle, Co Dublin, in November 2006.
It's understood they are due to move into a new house in an upmarket development beside Carton House in Maynooth, where Brian regularly plays golf -- and they hope to be in before Christmas.
A source revealed: "Like other couples who are expecting a new baby, they just decided they needed more room. They love where they're living now but it was time for a move."
The pair are just one of the well-known Irish couples who have joined the latest baby boom. Also expecting to hear the pitter-patter of tiny feet next year are Anna Daly and husband Ben, Amy Huberman and Brian O'Driscoll, Laura Woods and partner Mark, Triona McCarthy and boyfriend Will and Leigh Arnold and fiance Steve Davies.