04/08/2014 09:54 am ET Updated Dec 06, 2017

Julianne Hough Rocks Revealing Dress While Guest Judging On 'DWTS'

Julianne Hough wowed on "Dancing with the Stars" Monday night, April 7, but it wasn't her dance moves that turned heads.

The former "DWTS" pro served as a guest judge on the latest episode of the competition series and took to the stage in a clingy black gown featuring a keyhole cut-out design.

"First of all, welcome back," host Tom Bergeron told Hough as she took a seat at the judges' desk. "And secondly, wow, what a dress!"

Hough, 25, looked glamorous in the frock, rocking a blond pixie cut and sultry makeup. Her boyfriend Brooks Laich made sure to tweet at his lady following her appearance on the show, posting a photo and writing, "Dang, this guest judge on @DancingABC is cute!"

Hough, of course, retweeted her man's sweet words:

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Julianne Hough Through The Years