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On Sunday night, the WWE's WrestleMania 28 was held in Miami. As previously reported, Machine Gun Kelly was on hand to introduce John Cena by performing his song, "Invincible."

But, there were a couple of surprises. Diddy came out to introduce the rapper and MGK was accompanied by Skylar Grey to perform the book for "Invincible." You can check out some photos on WWE.com.