The Lucian Freud Exhibition is so popular that I had to wait an hour to get in.
Apparently they give away 500 tickets per day only because the rest is booked.
The exhibition space was crowded but it was worth going and seeing the
artist's last (unfinished) work and his other famous paintings. 

The National Portrait Gallery in London.
Lucian Freud Portraits is on until 27.05.12.