Rachel McAdams has been absent from the recent Mean Girls reunions and the new musical movie, but she showed her support in a surprise appearance on Saturday Night Live over the weekend.

McAdams introduced Renée Rapp, who portrayed Rachel's Regina George both on Broadway and in the movie — and made her musical debut on SNL.

Rapp performed "Not My Fault," her Mean Girls soundtrack collaboration with Megan Thee Stallion, who made a surprise appearance of her own, popping out of an oversized cake.

Megan — who declares herself "the black Regina George" in the track — drove the point home by posting a recreation of the famous "pointing Spideys" meme with Rapp, Rachel and herself.

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