This will probably go down as one of the best birthday weeks of model Anne V's life. The Sports Illustrated stunner, who turned 29 yesterday, announced that she and boyfriend Adam Cahan are having their first child.

The model, whose full name is Anne Vyalitsyna, delivered her exciting news on Twitter and Instagram with an ultrasound picture of her new baby's adorable, tiny feet. She wrote, "On this birthday I couldn't feel luckier, happier & more grateful. Adam Cahan & I couldn't be more excited for you!"

She also revealed that she is already several months along in her pregnancy in her latest Instagram post which featured her, Christy Turlington, and one very pronounced baby bump! She captioned the snap, "So proud to be a part of @everymomcounts! Thank you @cturlington for your love and birthday wishes and for being the best role model ever!!!"

Vyalitsyna, who has appeared in the Sports Illustrated Swimsuit Issue 10 years in a row, and Cahan, senior vice president of mobile and emerging products at Yahoo, have been dating since last year.