It's a Boy for Alessandra Ambrosio!

Alessandra Ambrosio is the proud new mother of a little boy.

The super duper model gave birth yesterday, according to a very reliable source: Brazilian fiance Jamie Mazur, who Tweeted: “Welcome my son, can’t wait to show u around this crazy place.”

The exciting event took place just days after a baby shower for Ambrosio, which included some serious pregnant tummy skin painting, as you can see above. This wasn't the first time Alessandra showed off her baby bump, either.

The beauty is also the mother to a three-year old named Anja and we wish this growing family full health and happiness!