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Lip Sync Battle: Katharine McPhee performs Shake Ya Ass

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Kelsey McNeal/SpikeTV

Katharine McPhee performs Mystikal’s “Shake Ya Ass” in her upcoming Lip Sync Battle against Jason Derulo and does, indeed, shake her ass — something that appears to shock Chrissy Teigen, who gasps theatrically as McPhee backs it up. 

McPhee spends the rest of her time onstage pulling dollar bills from her bra and swinging around a ridiculously large gold chain to the heavily censored song (Lip Sync Battle‘s PG name for it is “Shake It Fast”).

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Watch the sneak peek above, and see Lip Sync Battle when it airs Thursdays at 8 p.m. ET on Spike. 

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