Happy Birthday, Adalaide!

Katherine Heigl’s kids are getting so big and her youngest daughter just turned five! The former Grey’s Anatomy star took to Instagram to share the most touching tribute to her little girl on her special day.

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“It is my sassy, fiery, break dancing, bug loving, whip smart, fiercely loyal, daddy's girls' birthday! HAPPY 5TH BIRTHDAY ADALAIDE MARIE HOPE KELLEY! I am so incredibly grateful for the light, the love, the laughter, the purpose, the joy and the grace you have brought to my life! Thank God the world has a girl like you to show us how it's done!” the mom-of-three wrote in the caption of an adorable mommy-daughter selfie.

Katherine shares eight-year-old daughter Nancy Leigh “Naleigh,” five-year-old Adalaide Marie Hope, and three-month-old Joshua Bishop with her husband, singer Josh Kelley. The couple adopted Nancy from South Korea in 2009, then three years later they adopted Adalaide from the US.

In a recent blog post, the proud mama opened up about what it was like bringing Adalaide home since it was her first time being a mom to a newborn baby — Nancy was already 10 months when they adopted her.

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“Adalaide was just a 4-pound, 11-ounce newborn who we woke up every five seconds to check on when we first brought her home,” the 38-year-old wrote. “We were so terrified of how small and new she was. Truly petrified that every pause in her tiny snuffles and grunts meant that she was not breathing.”

But even though Katherine and Josh were nervous, first-time parents of a newborn, their experience with Adalaide helped prepare them for parenting their son — and the Doubt star can’t get enough of her newborn baby boy. Ever since she gave birth to him in January, Katherine has been sharing adorable photos of her spending some quality bonding time with little Joshua.

“[Josh Kelley] caught me soaking up some morning baby love,” she wrote in the caption of one particularly sweet photo.

Scroll through the gallery below to see more photos of Josh and Katherine’s kids!