Ambrosio092511_02_230.jpgWho knew that while Alessandra Ambrosio was strutting her stuff down the runway in the annual Victoria's Secret holiday fashion show, she was actually pregnant!

The supermodel will welcome her second child in 2012 with fiancé, California businessman Jamie Mazur, her rep confirms to Us Weekly. The pair also have a daughter Anja, 3.

Ambrosio said in a statement:

    "Family is the most important thing for me and I'm thrilled to be adding to the family. I'm fortunate to have a loving and supportive family. It's a blessing that it will soon be growing."

The Brazilian stunner is four months along, but does not yet know the gender of her baby.