During the game, the Mortal Instruments: City of Bones actress had to name items or people that fit into categories such as Harry Potter characters, pop singers, and body parts.
Watch the video below to find out who won!
Catch Lily in her movie Rules Don’t Apply, set to hit theaters on November 23.
Know It All with Eddie Redmayne and Lily Collins
Also pictured inside: Musical guest Martha Wainwright also appearing on the show.
Click inside to see an Instagram photo Lily Collins shared that night…