AceShowbiz - Allison Holker and Stephen "tWitch" Boss have welcomed their little bundle of joy. The former "Dancing with the Stars" pro dancer recently gave birth to her and her husband's second child together, a baby girl named Zaia Boss.

The proud parents took to Instagram to announce the good news and share a first glimpse of their daughter. In the black-and-white image, Zaia is holding on tightly to her mom's finger while tWitch places his palm under Allison's hand.

Sharing details of the baby's measurement, 31-year-old Allison wrote in the caption, "ZAIA BOSS 9 lbs 3 oz - 21 inches long. Healthy beautiful angel." tWitch posted the same photo on his own Instagram account and simply captioned it with the baby's name "Zaia."

Allison and tWitch, who are both former contestants on "So You Think You Can Dance", tied the knot at Nigel Lythgoe's Villa San Juliette Vineyard and Winery in Paso Robles, California on December 10, 2013. They welcomed their first child together, a son named Maddox Laurel, on March 27, 2016. tWitch also became a father to Allison's 11-year-old daughter Weslie from her previously relationship with an ex-fiance.

The couple announced Allison's latest pregnancy in a special Mother's Day episode of "The Ellen DeGeneres Show". "Being that it is Mother's Day, we thought this was the perfect opportunity to announce that we're having a baby!" she told the crowd during her surprise appearance on the show, where her husband has been a DJ since 2014.

While their son Maddox was too young to fully grasp the concept of being an older sibling, Weslie was excited to have a sister. She had "tears coming down her face," Allison said of her daughter, adding. "She loves being a big sister."

Opening up about what he needed to prepare to welcome his daughter, tWitch told MINI magazine in October, "Sheer joy and elation. Then the reality set in that I need to learn to do hair!" He jokingly shared his plan, "Everyday ponytail for the win."