Per Bergeron, the pro dancer turned actress will step in as a guest judge in place of long-time head panelist Len Goodman during the Oct. 7 show. Goodman plans to take a few weeks off to attend to his "Strictly Come Dancing" duties.
Hough told Bergeron that she is "so excited" to serve alongside judges Carrie Ann Inaba and Bruno Tonioli since she knows how it feels to be a competitor.
Whether or not a conflict of interest will come into play remains to be seen, as Hough is the younger sister of current "DWTS" pro and four-time winner Derek Hough, who is paired up with "Glee" star and ostensible frontrunner Amber Riley. The elder Hough won the Emmy for Outstanding Choreography during the Sept. 22 awards ceremony.
Julianne Hough won "DWTS" seasons four and five with Olympian Apolo Ohno and Indy champion Helio Castroneves. After departing the show following her season eight partnership with then-boyfriend Chuck Wicks, she concentrated on establishing a career in country music and appeared in a remake of "Footloose." Most recently, she starred alongside Josh Duhamel in "Safe Haven."
"Dancing with the Stars" season 17 airs Mondays on ABC.