According to a 'leaked document' that somehow made its way to the Daily Mail, Pet Shop Boys, One Direction, Jessie J, Tinie Tempah, Take That and a couple of other British-born singers will all perform at the Olympic closing ceremony.
Apparently the Pet Shop Boys will do 'West End Girls' (amazing), One Direction will do 'What Makes You Beautiful' (amazing) and Jessie J and Tinie Tempah will do 'You Should Be Dancing' (HAHAHAHAHAHA).
Take That will then show up a bit later to belt out 'Rule The World' which will probably go down quite well to be honest.
You can see the full list of what's supposedly occurring here. That's a lot of Russell Brand :(