The shag haircut works on different face shapes, says Salcedo. This versatility is what makes it so popular. "It's an edgy haircut --women want to feel refreshed and up with the new," he says. "I think its daring appeal catches their attention."

If you have a round face like Michelle Williams, one thing to keep in mind is that your shag haircut shouldn't be cut chin-length or shorter -- it should be kept longer to elongate your face, advises Salcedo.

According to L'Oréal Paris Consulting Hair Expert Mara Roszak, if your face can handle bangs, it can handle this style. Yes, even if you have curly hair. Just be sure you choose a stylist who is familiar with curly and frizzy hair, as the length of your layers will shorten as they dry, she cautions.

Image via @amandascott

Curtain bangs and messy texture give Dakota Johnson's shag haircut that too-cool-for-school vibe. To style your shag, Salcedo says the most important product to use is a texturizer. (We love Oribe Dry Texturizing Spray, $44.) He says to grab your trusty dry shampoo and spray it in your roots and layers. Then use a matte pomade, like Sally Hershberger 24K Texturizing Paste, $40, on the ends of your hair to get that piece-y look.

Taylor Swift's hair has inspired many a woman -- myself included -- to make the chop. One of Tricomi's favorite ways to style a shag haircut is to blow dry it straight, then use a wax (try Warren-Tricomi Style Wax, $18) to spike it a bit. A wax or paste is essential when styling your shag, as it gives the cut hold and definition.

Ashley Benson's shaggy 'do has tons of texture. "The messier, the better," says Salcedo. He says a salt spray will give you overall texture and help you bring out waves in your hair. "Scrunch the product onto your hair, shake it up a bit and call it a day." Easy peasy.