Here’s how she got the look.

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If you didn’t already know, the newMean Girlsmusical hits theaters this week.

Our new Regina George,Renee Rapp, was there, as wasMean Girlssoundtrack stapleMegan Thee Stallion.

Lindsay Lohan wearing voluminous waves and a black dress

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The original Cady Heron, Lindsay Lohan, also made a surprise appearance.

Which she did with hermermaid wavesandsparkly French tipsthat had us screaming, “Grool!”

She said that this helps “to build a strong foundation for the sculpted end result.”

Lindsay Lohen at the mean girls musical premiere with mermaid waves and sparkly French tips

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She says this step adds almost all the volume needed.

Then, it was time for thoseflawless waves.

As she curled, she sprayed more hairspray every time she added heat.

Lindsay Lohen at the mean girls musical premiere with mermaid waves and sparkly French tips

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Then, she used her “secret weapon,” the Blow Dry Brush for extra smoothness.

The last step was some final spritzes of hairspray, then Lilo’s hair was mermaid perfection.

Priano tucked one half behind her ear before the star stepped onto the red carpet.