Derek Hough and wife Hayley Erbert are gearing up for the biggest jobs in their lives: mom and dad. In July 2025, the Dancing With the Stars judge and dancer Hayley shared that they were expecting their first baby together. "We can't believe the biggest thing to happen to us could be so small," Hayley, 30, captioned her Instagram announcement video at the time, which featured glimpses of her baby bump. The short clip also showed Derek, 40, walking toward his wife before she wrapped her arms around his neck and showed off ultrasound photos. "Already so loved ," Derek captioned a few maternity pics via Instagram. In an interview with A Big Bold Beautiful Journey stars Margot Robbie and Colin Farrell for Extra in September 2025, Derek shared that their baby is due in December. "God, great Christmas set up for you!" Farrell, 49, a dad himself, reacted. "Love Christmas, love babies, love it all. It's so good," new mom Robbie, 35, added. Below, see Hayley's best bump photos ahead of her Christmas baby: