  We study associated production of prompt photon and two jets at high energies
in the framework of the parton Reggeization approach, which is based on
multi-Regge factorization of hard processes and Lipatov's effective theory of
Reggeized gluons and quarks. In this approach, initial-state off-shell effects
and transverse momenta of initial partons are included in a gauge-invariant
way. We compute azimuthal angle difference spectra in $\gamma + 2 jets$ events
and compare results with data from D0 Collaboration at the Tevatron. It was
found that agreement between predictions and data can be achieved only under
assumption on strong violation in transverse momentum ordering during
initial-state QCD evolution which corresponds multi-Regge kinematical regime
instead of DGLAP picture.
