Dancing With the Stars judge Derek Hough is in disbelief over wife Hayley Erbert's latest pregnancy milestone. "I can't stop looking at this freakin cute bump happening ," Hough, 40, wrote via Instagram on Thursday, August 21, adding a "Baby Hough" hashtag and tagging Erbert's account. In the clip, Erbert, 30, showed off her growing baby bump in a fitted Alo bodysuit while Bibi Gold's "Wonderlicious Woman" played in the background. Hough and Erbert's DWTS costars were equally excited about the new arrival in the comments section. DWTS' Derek Hough and Hayley Erbert Expecting Baby No.