For everyone wondering what Lily was giggling about in this clip, she was admitting to being a Harry Potter nerd.

Chris Hardwick: Do you have nerds in England?
Lily Loveless: Yeah! [points at herself]
CH: You are? You! What are you nerdy about?
LL: Are Harry Potter and The Lord of the Rings nerdy?
CH: Um, I don’t wanna — [she interrupts]
LL: I don’t think they’re nerdy because everyone loves them, don’t they?
CH: Which house would you be sorted into?
LL: Gryffindor. I did it!
CH: You did?
LL: You know you can do the thing, on Facebook, I was in Gryffindor! [here’s the giggle!]
CH: Do they make everyone Gryffindor?
LL: No, I’ve had friends that have been in Hufflepuff. [makes a face] Pff, yeah, good luck!