Alessandra Ambrosio has announced that she is pregnant with her second child.

The 30-year-old Brazilian beauty announced yesterday that she is expecting another bundle of joy with longtime fianc Jamie Mazur.

The Victoria's Secret model and the California businessman are already parents to three-year-old daughter Anja but said they were ecstatic to be giving her a little brother or sister.

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

Alessandra told Brazilian magazine Istoe Gente that she is four months along but that she does not yet know the gender of the baby.

She revealed that she surprised Jamie with the happy news on his birthday in September by showing him the positive pregnancy test.

Alessandra walked the catwalk just last month for the annual Victoria's Secret lingerie fashion show but her bump was not visible.