Everybody cut loose at the Footloose afterparty in L.A. Monday -- even Ryan Seacrest!
"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," a party guest tells Us Weekly. "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."
"It's like really awkward, but really cute," she gushed of Seacrest's skills. "My brother Derek does a better impression."
"He's a very good dancer for an average-sized person," 24-year-old Miles Teller, who plays Willard Hewitt in the remake, joked Thursday.
Added star Kenny Wormald, 27: "He's very impressive!"