\"Our hearts have doubled in size for our Jetty boy,\" she wrote in a separate post that featured more photos of her newborn. \"He’s the most perfect addition to our family and has already given us so much joy! We love you baby boy.\"

View this post on Instagram

A post shared by Witney Carson McAllister (@witneycarson)

McAllister also posted photos of their family to announce their son's arrival.

\"I am so happy to call @witneycarson the mother of my TWO precious boys,\" he captioned the post. \"She keeps me calm and keeps her cool cause she knows I’m loosing it inside.\"

He continued, \"You’re my rock babe! Im so proud of you! Mothers will never get the credit they deserve for bringing little ones into this world. I love my little growing family! #familiesareforever #family\"

Carson announced in November on \"DWTS\" that she and McAllister were expecting their second child.

\"I'm so excited to finally announce that Carson, Leo and myself are expecting baby No. 2,\" she said at the time. \"I'm so blessed and this just felt like a really good time to share it, and I can finally share it, which feels great. I'm very blessed.\"

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