  We present complete two-loop radiative corrections to the
graviton-quark-antiquark form factor G^* \rightarrow q \overline q and
graviton-gluon-gluon form factor G^* \rightarrow g g in SU(N) gauge theory with
n_f light flavours using d-dimensional regularisation to all orders in
\varepsilon=d-4. This is an important ingredient to next-to-next-to-leading
order QCD corrections to hadronic scattering processes in models with large
extra-dimensions where Kaluza-Klein graviton modes couple to Standard Model
fields. We show that these form factors obey Sudakov integro-differential
equation and the resulting cusp, collinear and soft anomalous dimensions
coincide with those of electroweak vector boson and gluon form factors. We also
find the universal behaviour of the infrared singularities in accordance with
the proposal by Catani.
