Copy Olivia Wilde's humidity-proof hairstyle from the "Third Person" screening on June 17, 2014 Credit: Dimitrios Kambouris/Getty Images

Humid weather is here, but rather than stay inside all day and night this summer, Olivia Wilde has presented frizz-fearing women everywhere with a smooth solution.

While attending the premiere of her new movie Third Person, hosted by The Cinema Society & Revlon, on Tuesday, June 17, in New York City, the new mom, 30, rocked an incredibly soft-wave hairstyle with her striped Stella McCartney dress—despite soaring temperatures.

"It was sticky and humid out, so I didn't want her hair to look or feel too heavy or weighed down," celebrity stylist Rebekah Forecast told Us Weekly. "I wanted to give her a style that enhanced her natural wave and looked smooth and effortless."

To achieve a similar look, Forecast recommends misting wet or dry hair with Herbal Essences Tea-Lightfully Clean Blow Dry Prep Mist, and then working one to two pumps of the humidity-proof Herbal Essences The Sleeker the Butter Smooth & Creamy Hair Milk through the ends.

Then, blow dry hair on low heat and spray hairspray before using a curling iron to add in loose waves. After curling two-inch sections at a time, apply three to four pumps of Herbal Essences Moroccan Me a Miracle 7-in-1 Serum through the ends to smooth and add shine.