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Rene\u00e9 Rapp<\/a>\u00a0made her <\/span>Saturday Night Live<\/em><\/a> musical guest debut over the weekend, and got a little help from\u00a0<\/span>Megan Thee Stallion.<\/a><\/p>\n After being <\/span>introduced by OG Mean Girls star Rachel McAdams<\/a> in a delightful surprise cameo, Rapp hit the Studio 8H stage, rocking a black open jacket, bra-top and black jeans for a performance of <\/span>“Not My Fault,” from the new Mean Girls<\/em> movie<\/a>.<\/span><\/p>\n Rapp’s all-black ensemble stood out against the appropriately pink-clad backup dancers and elaborate pink two-tiered cake that dominated the stage.<\/span><\/p>\n Halfway through the number, the cake rotated to reveal Megan standing inside, surprising the<\/span> SNL<\/span><\/em> audience, and joining Rapp for a flawless delivery of their catchy collaboration.<\/span><\/p>\n ET <\/span>spoke with Megan at the Mean Girls<\/em> premiere<\/a> earlier this month and she praised Rapp and their collaboration.<\/span><\/p>\n “I love Rene\u00e9. As soon as I met her I was like, ‘Oh, you my friend. OK.’ I love it. I love her and I love\u00a0<\/span>Mean Girls<\/span><\/em>,” Megan told ET.\u00a0“It was only right they had to call the H-Town hottie out here. I been calling myself the Black Regina George for, like, ever. And here I am. This is really my dream, so I’m so happy. I’m excited to be a part of this.<\/span><\/p>\n Before their performance together, Rapp also delivered a stirring and memorable performance of her single “Snow Angel,” the title track off her debut album released back in August.<\/span><\/p>\n