We present an event generator for the process $pp\to \ell {\nu }_{\ell }\gamma$ at next-to-next-to-leading order (NNLO) in QCD and matched to the Pythia8 parton shower. The calculation makes use of the Geneva framework, which combines a resummed calculation obtained via Soft-Collinear Effective Theory (SCET) with the fixed-order result. We validate the NNLO accuracy of our results by comparing predictions for inclusive quantities with an independent fixed-order calculation, and then present the resummed partonic 0-jettiness spectrum at next-to-next-to-leading logarithmic (NNLL′) accuracy. Finally, we compare our predictions against data collected by the ATLAS experiment at the Large Hadron Collider during its 7 TeV run, finding good agreement.