From published and new mid-eclipse times obtained between 1988 and 2010 we findlong-term eclipse time variations in the post-common envelope eclipsing binary NN Ser. We find strong evidence for two circum-binary planets in this system with orbital periods of P-c=15.5 and P-d=7.7 yrs, small eccentricities of e(c) approximate to 0 and e(d)=0.2 and lower mass limits of M-c sin i(c)=6.9 and M-c sin i(c)=2.2 M-Jup. The periods suggest that the planets are locked in a 2:1 resonance. A second solution with a 5:2 resonance and slightly modified planetary parameters results in a nearly equal reduced chi(2). The progenitor system is estimated to consists of a approximate to 2 M-circle dot primary and the present M dwarf secondary at approximate to 1.5 AU distance. The first generation formation of planets and their survival in the later evolutionary stages or the second generation formation in the common envelope shed new light on planet formation and evolution.