"First time in costume since we made the movie! So excited," Olivia wrote as she posted the image.

Olivia was seen wearing a "good Sandy" outfit with a yellow midi-skirt and cardigan over a white shirt and flat shoes, while Travolta went for Danny Zuko's iconic quiff hairstyle and leather jacket look. But what caught attention was Travolta's hair.

After flaunting bald for about a year, Travolta surprised his fans with the new look.

"Where did you borrow the hair from?" one wrote, while another said: "How did you grow hair?"