Allison Holker, a Dancing with the Stars pro, and her husband, Stephen "tWitch" Boss from So You Think You Can Dance, have revealed whether they'll soon be parents to a son or daughter.

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"It's a boy!!!! #BabyBossboy surrounded by so much love today!!! Life is beautiful," Boss, 33, captioned a Thursday Instagram photo of the couple showing off their blue gender-reveal cake with vanilla frosting on the top.

Holker shared the same photo on her own social media account as well as an additional picture of her noticeable baby bump.

"ITS A BOY," she wrote alongside the image which featured Boss cradling her stomach.

Holker, 27, told People she's "so excited for everyone to know and be able to celebrate with us because our whole family is just so excited about this. It's the biggest blessing."

Holker revealed she was pregnant during an early October broadcast of Dancing with the Stars' 21st season. While being interviewed backstage by co-host Erin Andrews following her performance with celebrity partner Andy Grammer, Holker wanted to discuss the night's "Most Memorable Year" theme.

"As a pro... [it's] really such a special time because we get to celebrate someone's beautiful story and share it with the world," Holker told Andrews before asking Boss and her seven-year-old daughter from a previous relationship to join her.

"This is my daughter. This is my husband. And 2015 is actually turning out to be such a memorable year for us because we actually recently found out that I'm pregnant!"

"We got a mama in the ballroom!" Andrews excitedly pointed out as the DWTS cast, audience and judges cheered. "Congratulations to all three of you."

Married by SYTYCD co-executive producer Jeff Thacker, Holker and Boss exchanged vows at SYTYCD creator and judge Nigel Lythgoe's California vineyard and winery in December 2013. Fellow DWTS pro Anna Trebunskaya attended their wedding.

Holker joined Dancing with the Stars as a pro for Season 19. She was also a Top 8 finalist on the second season of SYTYCD.

Boss finished as the runner-up of SYTYCD's fourth edition. A romance sparked in 2010 when he and Holker both starred on the seventh season of the series as all-star partners for the contestants. Boss also just served as the "Street" dancers' team captain on the latest season of SYTYCD.

About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.