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Jillian Dempsey also took to Instagram to celebrate their sons. In a post, she shared two throwback school pictures from when Darby and Sullivan were younger.

\"Baby A and baby B. AKA Sullivan & Darby,\" she wrote in the caption. \"Happy birthday to my boys. Can't believe you are 17! You make me proud to be your momma. I love you both very much. 🎈🎈🎈\"

\"Thank you for not making me delete this precious picture of your younger selves,\" she added.

Patrick and Jillian Dempsey also share a daughter, Talula Fyfe Dempsey, together.

In December, they stepped out together as a family for the premiere of \"Ferrari\" in Los Angeles.

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