Jessica Capshaw is expecting her third child with husband Christopher Gavigan.

The 35-year-old actress,  a.k.a. Dr. Arizona Robbins on Grey’s Anatomy, broke the news on Twitter:

“It is with profound happiness and sheer delight that @Christopher_Gav and I can say that another sweet Gavigan baby is on the way!” she wrote.

Capshaw and Gavigan, who is the former CEO of the nonprofit Healthy Child Healthy World, are already parents to son Luke Hudson, 4, and daughter Eve Augusta, 14 months.

And not only will the new arrival have some famous parents, but some A-list grandparents as well. Capshaw’s mom is actress Kate Capshaw and her step-father is Steven Spielberg.

(Photo credit: Jeffrey Mayer/WireImage.com)