The author celebrated her 33rd birthday on Dec. 13.
"Join me in wishing my sweet Katherine a Happy Birthday," the actor wrote. "The kids and I are grateful to have you. You’re such a blessing to everyone around you. We love you!"
Pratt’s post led with a picture of him and the birthday girl from their wedding. Additional pictures included various moments of the couple with their daughters, Lyla, 2, and six-month-old Eloise, whose faces the Jurassic World star covered up with pink hear emojis.
The couple spent Schwarzenegger’s birthday in the Brentwood neighborhood, smiling and holding hands after shopping and eating lunch.
Schwarzenegger also got a very special birthday wish from her mother, Maria Shriver.
"Happy, happy birthday my beloved @katherineschwarzenegger! You are such a joy in my life. Your smile lights up everyone’s life. You have a heart of gold," she wrote next to a video of the birthday girl through the years.
"You are the best mama, wife, daughter, sister, friend, cousin, and confidante! You care about everyone. You are my everything! Nothing makes me prouder than to be your mama. Nothing makes me happier than to be in your company, laughing, playing, just being! God gave me the greatest gift in the world when he made me your mama! I love you to the moon and back, forever and ever! Happy happy birthday, baby!! 🥳🎉🎂 #happybirthdaykatherine," Shriver added.
The Maverick and Me author’s birthday wishes come six months after she penned a sweet dedication to her husband on his special day, along with a sweet collage of pictures.
"Birthday Boy! Happy birthday to you," she wrote. “We love you so much! I feel like the luckiest in the world to live life with you. You’re the most loving father, the most supportive partner and you have the biggest heart and we are so blessed to feel and witness your love. Happy happy handsome."
Pratt dished to ET about the special way his wife let him spend his birthday.
"The day before [my birthday], I got a hall pass to go golf, which was pretty fun," Pratt said with a beaming smile. "Yesterday, I had a very low-key day. I spent it with my daughters and wife, and I cooked some steaks at home. It was pretty fun!"