Just like Kendall Jenner , Bella Hadid is known for her sleek, dark hair. And while the color is still dark, it is anything but straight. In her post on Monday morning, the model appeared to be posing in front of a mirror with a curly wig (or a seriously good perm). The ringlets were so bouncy and tight, we could have been convinced that she was auditioning for the brunette version of Sandy in Grease. (She's not.) And she’s not the only model feeling the Sandra Dee vibes this year — Karlie Kloss was also seen in Australia working on a photoshoot donning similar ringlets. It wasn’t even that long ago that older sister Gigi actually was the character for Halloween.