The 23-year-old recently attended the afterparty for her new movie Footloose with her boyfriend Seacrest, 36, and he showed off some of his dance moves.
An onlooker said to Us Weekly: 'It was seriously like the end of the Footloose movie. Everybody down there, including Ryan and Julianne, were foot stopping and had their hands up.
'Julianne was so happy because apparently Ryan never dances and this was the exception he made for her, because he was so happy for her.'
Hough spoke herself about his dancing at the Nashville premiere of the movie.
She said: 'It's like really awkward, but really cute. My brother Derek does a better impression.'