Mary-KateandAshley Olsenwere two of the biggest stars in Hollywood throughout the 1990s and early 2000s.

First, wash your hair, and apply a defining mousse when it’s still soaking wet.

Next, you’ll need to part your hair properly before any styling tools are used.

Mary Kate and Ashley Olsen at an event

Next, apply a heat protectant spray to your hair, and grab a double-barrel curling iron.

These final steps vary depending on how you want the finished effect to come across.

Mary Kate and Ashley Olsen at an event in 2018

Mary Kate and Ashley Olsen pose for a picture