The characters in "The Simpsons" only have four fingers, but that doesn't stop them from using American Sign Language for the first time in the show's 31-year history in an upcoming episode.
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 ...
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