Allison Holker and Stephen "tWitch" Boss have welcomed a baby girl into the world.

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The couple shared their big news on Wednesday by posting a sweet black-and-white photo on Instagram of their newborn daughter's little hand wrapped around Allison's finger and resting on her dad's open palm.

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"ZAIA BOSS 9 lbs 3 oz -- 21 inches long," Allison, 31, captioned the photo, adding, "Healthy beautiful angel."

And Stephen, 37, shared a similar photo on Wednesday and wrote alongside it, "Zaia."

Stephen and Allison are already parents to a son Maddox, 3, whom they welcomed in March 2016. Allison is also mom to daughter Weslie, 11, from a previous relationship.

The dancing pair announced in May that they were expecting their second child together during a special Mother's Day episode of The Ellen DeGeneres Show, for which Stephen serves as a deejay.

"Being that it is Mother's Day, we thought this was the perfect opportunity to announce that we're having a baby!" Allison revealed to the crowd during a surprise appearance on the show.

In June, Stephen, a former So You Think You Can Dance contestant and judge, admitted he was doting on his then-pregnant wife, a former Dancing with the Stars professional dancer and SYTYCD alum.

"[I'm waiting on her] hand and foot," Stephen told Us Weekly.

"Also, I don't know what it is, [but] she has a superpower of just being just being absolutely incredible through pregnancies. She handles it with such grace and still looks just as beautiful. It's crazy."

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Allison and Stephen then revealed the baby's sex in August. The couple shared photos from a gender reveal party they had on Instagram, and Allison gushed at the time, "Can't even express all the incredible emotions we are feeling right now!"
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"I am so excited to be bringing in another beautiful baby girl into the world," Allison added.

"And we are so grateful for all the LOVE that we were showered with yesterday from our friends and family joining us in the gender reveal! This baby girl is already surrounded by love and support."

Married by So You Think You Can Dance co-executive producer Jeff Thacker, Allison and Stephen exchanged vows at SYTYCD creator and judge Nigel Lythgoe's vineyard and winery in Paso Robles, CA, in December 2013.

Allison joined Dancing with the Stars as a professional partner for Season 19. In her four seasons on the show, the highest Allison had ever placed was second with Riker Lynch on the show's 20th season.

Allison had also previously placed in the Top 8 on the second season of So You Think You Can Dance.

As for Stephen, he finished as the runner-up of So You Think You Can Dance's fourth edition and has made numerous appearances on the show ever since as a mentor or judge.

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A romance sparked in 2010 when Stephen and Allison both starred on the seventh season of the series as All-Star partners for the So You Think You Can Dance contestants.

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