We didn't expect this!

Katherine Heigl is pregnant with her first biological child with husband Josh Kelley, the actress announced in an adorable statement.

"The Kelley clan is thrilled to announce that we are expecting a third addition to our family. Naleigh and Adelaide could not be more excited to welcome their new sibling into the fold and Josh and I are overflowing with joy and gratitude," she wrote alongside a pic of her hubby and her two adopted daughters.

"This is an incredibly exciting time for us filled with hope, anticipation, and hormones. Well, only I’m filled with hormones, but everyone in the family gets to enjoy them. We couldn’t be more excited to be able to finally share this news with our fans and are looking forward to continuing to share the journey with you all. xoxo, Katie and Josh," she added.

The musician and the Grey's Anatomy star wed in 2007. Congrats Kelley clan!