Which paystub needed?

It's my first time doing my taxes since moving to and working UK in 2011.  I just found my 31 Dec paystub that would be needed for US taxes (as US is Jan-Dec). But just realized that my "YTD Gross Pay" is probably from April/May - Dec as the UK is different....perhaps?  Since I started my job in mid January what ppwk would I need to start filing my US taxes?

You need all of the paystubs from 2011 before 6 April 2011.