A person that lives their life vicariously through Kristen Stewart. They want to BE Kristen Stewart. They monitor the world wide web for any and all mentions of Kristen Stewart that are in a negative light and believe that, in time, they can change their views of Kristen Stewart.
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.