  We consider the production of a single $Z$ or $W$ boson in association with
jets at the LHC. We compute the corresponding cross sections by matching NLO
QCD predictions with the Herwig++ and Pythia8 parton showers, and by merging
all of the underlying matrix elements with up to two light partons at the Born
level. We compare our results with several 7-TeV measurements by the ATLAS and
CMS collaborations, and overall we find a good agreement between theory and
data.
