Serious Nicknames

Earlier this week I was talking with Leah about nicknames, while Laurence listened intently.
Me: Is your nickname Preposterous?

Leah: No.

Me: Is your nickname Miss Pants?

Leah: No.

Me: Is your nickname Goose?

Leah: No.

Me: Is your nickname Cinderella Butterfly?

Leah: Yes!

Lars: My name Chocolate Cake!

Me: Really?

Lars: My kidding! Heh. Heh.

Leah: My nickname is Vanilla Cake!

She is pretty white.