Why wasTiffany Haddishwalking the runway at the Monse show?
Short answer: because Kathy Hilton dared her to.
For the long answer to the Tiffany Haddish and Kathy Hilton runway controversy, keep reading.

Gilbert Carrasquillo
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But while Paris clearly saw the whole thing as harmless fun, the commenters saw something different.
I can only say for certain that the joke did not go over as well as anticipated.