This is clip of Elvis preforming "Relax" from "It Happened at the World's Fair."
The girl is Yvonne Craig who was also know as Batgirl. She was 26 when this movie came out. Hard to believe she is 71 now! WOW, I am getting old.
"Some people tap their feet, some people snap their fingers, and some people sway back and forth. I just sorta do ‘em all together, I guess." - Elvis Presley