Katherine Heigl - Lead
Credit: JB Lacroix/WireImage

If this photo is any indication, Katherine Heigl’s daughter Adalaide is going to be one heck of a big sister. The Grey’s Anatomy alum took to Instagram on Sunday to share the sweetest pic of her 4-year-old daughter cuddling her little cousin.

“Adalaide’s getting ready for her baby brother by practicing with her adorable cousin Ward! #cutecousins #gorgeouskids,” Heigl wrote. “Thanks for the frameable pic aunt @cassiemkelley!” Judging by the happy look on little Ward’s face, he was having a blast with his big cousin.

VIDEO: Katherine Heigl's Cutest Family Instagram Photos

Heigl, who has adopted 4-year-old Adalaide and 7–year-old Naleigh, announced in June that she is pregnant with her third child (and first baby boy!) with husband Josh Kelley. “The Kelley clan is thrilled to announce that we are expecting a third addition to our family,” she said in a statement to People. “Naleigh and Adalaide could not be more excited to welcome their new sibling into the fold and Josh and I are overflowing with joy and gratitude.”

Just last week, the 37-year-old actress shared a stunning bare photo of her bump to Instagram, and the new addition’s arrival doesn’t look to be too far away!