Watch Ansel Elgort Prank Jimmy Kimmel's Niece

The actor wears a lion disguise to fool his fan

Jimmy Kimmel's niece, Allison, is a huge fan of The Fault in Our Stars actor Ansel Elgort, so Kimmel asked Elgort to help him prank Allison by pretending to be a Hollywood makeup artist.

Elgort pulled off the prank beautifully, donning lion's makeup and using a German accent to throw the 12-year-old off. In the clip, Allison talks about how much she likes Elgort. Her new makeup artist friend responds by consistently making fun of the actor. Allison's reaction when Elgort goes for the big reveal is precious — watch the prank below.

See more Photos of 'Divergent,' 'Fault in Our Stars' Actor Ansel Elgort