Arguably, this is the cut that started it all.

Even ultra-glamorous, mermaid-haired J-Lo has chopped her hair into a lob. The key to getting her retro-inspired waves is to curl your hair in toward your face. Once the curls cool, brush through them and mist on a finishing spray.

The "Pretty Little Liars" starlet keeps her look fresh and youthful by adding just a hint of bend to her lob. Use a 1 1/4-inch curling iron to curl sections of your hair in opposite directions, but only heat each section for a couple of seconds. Spray on dry shampoo to add texture, and then use a styling balm like Leonor Greyl Baume Bois de Rose Modelling and Sculpting Balm, $49, on the ends of your hair to give it that piece-y texture.

Give your lob serious "It" girl vibes with a half bun, a la Kate Mara.

Ciara looks fierce as hell with medium-length hair. (And she's giving us serious #bangsgoals.)