"Dancing with the Stars" professional dancer Allison Holker, the partner of singer Andy Grammer on this season's edition of the ballroom dancing competition, is pregnant. The former "So You Think You Can Dance" contestant revealed her pregnancy news behind the scenes Monday night, before she and Grammer took to the dance floor to perform in the live competition. Her husband Stephen "tWitch" Boss was in attendance of the show to take part in the announcement. Afterward, Holker shared a photo of herself, her husband and young daughter from another relationship, Weslie, celebrating the news surrounded by the "Dancing with the Stars" cast. "WE ARE HAVING A BABY!!!!!!!!" she wrote, tagging her dancer husband. This will be Holker and Boss' first child together since marrying in December 2013. Holker also announced she is four months along and will remain on the show as her pregnancy progresses -- a first for the popular talent competition.