Derek Hough is sharing a behind-the-scenes look at how hard his wife, fellow dancing pro Hayley Erbert, worked to learn American Sign Language (ASL) in time for her best friend Britt Stewart's wedding.

The "Dancing with the Stars" judge, 40, posted a video Sept. 22 on Instagram that showed Erbert practicing her maid of honor speech in ASL so Stewart's groom, actor Daniel Durant, who is deaf, could understand her.

Hough captured videos of Erbert, who is expecting her first child with the pro , rehearsing how to sign her speech while working out in a gym and later while sitting in bed wearing a face mask. At one point, Hough is heard proudly telling his wife as he films her, "Babe, it's unbelievable. That makes me emotional watching you do that."

The video later shows Erbert getting c

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