The changing relationship between celebrities and art
22 May 2015 Last updated at 22:29 BST
It used to be easy to spot a celebrity - they were often film stars and their images were carefully controlled.
But thanks to mobile technology and the internet, celebrities today can be created in a flash and disappear just as quickly.
A new exhibition of 54 portraits opens today at the National Portrait Gallery in Washington. Eye Pop: The Celebrity Gaze, explores this changing relationship.
Jane O'Brien reports from Washington.
Filmed by Allen McGreevy. Edited by Bill McKenna