Warning: This article contains spoilers forMean Girls.

Let’s see if we can still do it,' and they can’t," Fey says.

Once they started filming, it wasn’t long before the cast had to grab their Santa hats.

Avantika plays Karen Shetty, Angourie Rice plays Cady Heron, Renee Rapp plays Regina George and Bebe Wood plays Gretchen Wieners in Mean Girls

Jojo Whilden/Paramount

“That was in our first week of filming,“Angourie Rice, who plays Cady, says.

That’s not my thing.'

So we had a stunt person and she was lovely,” Rapp says.

MEAN GIRLS, Lacey Chabert, Rachel McAdams, Lindsay Lohan, Amanda Seyfried, 2004

Original ‘Mean Girls’ Lacey Chabert, Rachel McAdams, Lindsay Lohan, and Amanda Seyfried perform the now-iconic “Jingle Bell Rock” number.Paramount/courtesy Everett Collection

In the end, it created the perfect embarrassing moment for Regina’s (literal) downfall.

Mean Girlsis in theaters now.

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