Doug Kramer took to social media to pen a heartwarming post for his son Gavin as the latter celebrated his birthday.

"My little twin, I'm just so proud of how you are growing up to be a strong willed, hardworking, sympathetic and God-fearing boy!" Doug wrote on his Instagram page as he greeted his son.

Doug then enumerated things that he admires most about his son, saying: "I love seeing how much you love your mom and sisters. I love that you never hesitate to be a servant for others. I love that you value hard work."

Doug went on: "I love that you always ask how our day went. I love that your imagination of stories and characters are so unique. A storyteller! I love that your weakness is exactly like mine, pastries. 😂 I love that I hear your intimate prayers to God at night. I love that you value your family so much!"

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A post shared by Doug Kramer (@dougkramer)

The celebrity dad remarked that there's so much that makes Gavin uniquely him.

"Happy 12th birthday to my one and only son. I love you Gavin! ❤️" he said.

Fans online were quick to extend their birthday wishes for Gavin.

"Happy 12th birthday Gavin!!! May God bless you with more 🎂," one fan commented.

"Such a sweet boy! Happy birthday Gavin!" another fan wrote.

Doug is married to Chesca Garcia. They tied the knot on October 9, 2008. The couple celebrated their 16th wedding anniversary last year.

Aside from Gavin, they have two other kids, Kendra and Scarlett.

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A post shared by Doug Kramer (@dougkramer)

Back in December, the family experienced their first winter together as they celebrated the Christmas season in the US.

"Core memory for all of us as we experienced snow fall together for the first time! Truly magical and quite an experience," Doug wrote.

"So grateful to the Lord for a wonderful time with the kids throughout this vacation. We love you @kramer.kendra @scarlettkramer and @gavinkramer! You are our favorite gifts forever," he added.