Here’s how Regina George ended up co-writing a crucial song for Cady Heron.

“We had written a lot of different songs for Cady to fire up the movie.

And then we wrote a couple of versions of that for the movie.”

Renee Rapp plays Regina George in Mean Girls from Paramount Pictures.

Reneé Rapp in ‘Mean Girls’.Jojo Whilden/Paramount

Jojo Whilden/Paramount

Rapp, who successfully launched her own music career in recent years, jumped at the opportunity.

I was really, really excited."

And for Rapp, she’s walking away with more than she expected from the experience.

“This is a crossover of every career that I have in my life,” Rapp says.

There’s also my theatrical songs that are a part of the movie.

It’s literally everything I do, all in one project."

Mean Girlshits theaters this Friday.

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