Jon Kopaloff/FilmMagic

Mila Kunis' youthful updo stole the show at last night’s premiere of “Extract" in LA. Below, Mara Roszak— the stylist behind the look— shares how to recreate it in 4 simple steps (and for under $15!):

Step One: Prep
Apply TRESemmé 24 Hour Body Foaming Mousse on damp hair from roots to ends. Rough dry hair until it is completely dry, parting hair slightly more to one side.

Step Two: Curl Your Tresses
Use a 1” curling iron all over the head, rotating the direction of the waves. Spray each section with TRESemmé Frizz Shield Finishing Spray, and tousle waves with fingers.

Step Three: Create a Bun
Pull hair into a low pony towards the opposite side of the part, securing with an elastic. Twist into a loose bun, and secure with criss-crossed bobby pins.

Step Four: Finish the Look
Leave soft pieces around the face and around the bun, keeping one side cleaner with fewer loose pieces. Finish by misting TRESemmé TRES Two Ultra Fine Mist Hairspray for a long lasting look.