download the appSign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read previewReneé Rapp recently made her "Saturday Night Live" debut, and she had a very special guest show up to support her. When she took to the stage to perform, the star of the musical "Mean Girls" remake was introduced by none other than the original Regina George herself, Rachel McAdams. AdvertisementRapp then performed "Not My Fault," which appears on the soundtrack of the "Mean Girls" remake. Rachel McAdams in "Mean Girls" (2004).

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