Brooklyn Decker & Andy Roddick Expecting First Child

Instagram

This will be the first child for Decker and tennis pro hubby Andy Roddick.

Make that #the5ofus.

Brooklyn Decker and husband Andy Roddick are expecting their first child.

Decker made the announcement in an adorable tweet on Saturday, captioning a photo of herself cradling an itty bitty baby bump with, "So this happened... #the3ofus."

NEWS: Prince William and Kate Middleton Welcome Royal Baby No. 2!

The cute couple is going to have one full house this fall! Decker, 28, married the retired tennis pro, 32, in 2009 at their home in Texas, and they're already parents to two bulldogs, Billie Jean King
and Bob Costas.

Which kind of explains this roomy top she wore to the premiere of her new show, Grace and Frankie, three days ago…

Thanks to throwback pics Decker posted last August on both her hubby's and her little brother's respective birthdays, we can only assume this will be one athletic, blonde kid!

PHOTOS: Celebrity Bridesmaids

Roddick may be Decker's soulmate, but who would play the former Sports Illustrated model in a movie? Watch the video below to find out.