Y'know the drill. These threads normally produce gems.
In no order:
Shakira- She Wolf
Beyonce- Sweet Dreams (especially the Weezy No Ceilings version)
Jay Z- Empire State of Mind (chart, maybe not pop, but still brilliant)
Jay Sean ft. Weezy- Down (if only for the Weezy rap, class)
Britney Spears- 3 (how didn't this chart higher, i ask you)

Lady Gaga for one or two others maybe. Beat Again has lost it's appeal.