The "How I Met Your Mother" star shared an adorable family picture on his photo-video sharing website account and opened about how much he love his husband.
"Happy Birthday, David. You're the most glorious husband/father/person I've ever had the pleasure of knowing," the 43-year-old actor wrote.
"My love and appreciation for you is immeasurable. May this be your best year yet! xoxo @dbelicious."
The photo captured Burtka gazing down at his candlelit birthday cake as the couple's two children - Harper Grace and Gideon Scott, both six - sat beside their father, waiting for him to make a wish.