  In this talk we present the first calculation of next-to-leading-order QCD
corrections for the production of $W^+W^-$ pairs in association with three jets
at the LHC. We show the observed improvement in the dependence of total and
differential cross sections on the unphysical renormalization and factorization
scales. We study the radiation pattern for configurations associated to
vector-boson fusion and the impact that the QCD corrections have on them.
