Star dancers Allison Holker and Stephen "tWitch" Boss have welcomed their son into the world!

The "Dancing With the Stars" pro gave birth to her and the "So You Think You Can Dance" alum's first child on Sunday. Maddox Laurel Boss is the happy couple's first baby together, although Holker does have a 7-year-old daughter Weslie from a previous relationship.

"[Maddox's birth] was truly an unforgettable moment and we are grateful to everyone that shared in the experience and made it so monumental," the couple said. "Our family feels full. Maddox already has the best big sister Weslie, they have already bonded and share a truly beautiful love."

Holker first announced that she was pregnant in October while competing on "DWTS" last season with her partner Andy Grammer. The special announcement was made during the "Most Memorable Year" show, so Holker brought her husband and daughter on to the set to share the exciting news.

"As a pro, 'Most Memorable Year' really is such a special time because we get to celebrate someone's beautiful story and share it with the world," she said at the time. "2015 is actually turning out to be such a memorable year for us because we actually recently found out that I'm pregnant!"

The 27-year-old pro dancer and tWitch, who is currently the DJ on "The Ellen DeGeneres Show," met while competing on "So You Think You Can Dance." They got engaged after just one year together and have been married for a little over two years now.

In December, they announced that they would be having a boy with a gender-reveal party that involved a tasty looking blue cake. "It's a boy!!!" tWitch captioned a photo. "#BabyBossboy surrounded by so much love today!!! Life is beautiful."

Holker recently opened up about her plans for giving birth. "I can't be sleeping when I go into labor," she said. "Who knows? It could turn into a dance party. There may be twerking!"

She then went on to explain how she just hopes her husband doesn't pass out. "He's nervous about a lot of it, because it's all new to him, but I know he's going to be an amazing dad," she explained. "Without a doubt, he and this baby will have a special connection - I know it."

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