  We report on the calculation of the NLO QCD corrections to top quark pair
production in association with two hard jets at the LHC. We take into account
higher-order effects in both the production and decays of the top-quark pair.
The latter are treated in the narrow width approximation and $t\bar{t}$ spin
correlations are preserved throughout the calculation. This is the first time
that such a complete study for this process is conducted at NLO in QCD. We
present results for fiducial cross sections at the integrated and differential
level. Furthermore, we investigate kinematic properties of the additional light
jets and their distribution in the $pp\to t\bar{t}jj$ process. We examine jets
in production and top-quark decays as well as the mixed contribution, where the
two hardest non-$b$ jets are present simultaneously in the production and decay
processes.
