When you think of Cindy Crawford, you immediately think of her signature brunette blowout, beloved since the 1980s. The supermodel has rarely (if ever) changed her hairstyle. But in honor of her husband Rande Gerber's annual Casamigos Halloween party, she embraced tight blonde curls. Although she did a double-take, the 57-year-old's new hairdo was a welcome surprise, perhaps the work of a very good wig.

To complete her costume, Crawford chose a one-night-only look: Sandy Olson of Grease fame. Celebrity hairstylist Peter Savick was the originator of her hairstyle. The hairdresser also did the hair of Crawford's daughter, Kaia Gerber, who wore an Edie Sedgwick-inspired pixie-cut wig.

To complete her outfit, Crawford chose a tight black bodysuit, black pants, and a matching black leather jacket with her husband (the Tequila King was, naturally, Danny's outfit). Her simple, glowing eye makeup looked the same as usual, but her intense red blush and lipstick stood out.

The cover girl completed her look with not-so-dainty gold hoop earrings. Overall, it was a far cry from the off-duty style she has curated over the years. A fan commented on Crawford's Instagram post, "You two are the best Sandy and Danny since OG Sandy and Danny!" commented. Truly shocking.