We report the discovery of three transiting exoplanets by the SuperWASP survey and the SOPHIE spectrograph with mass and radius determined with a precision better than 15%. WASP-151b and WASP-153b are two hot Saturns with masses, radii, densities and equilibrium temperatures of 0.31^+0.04^-0.03_M_J, 1.13^+0.03^-0.03_R_J, 0.22^+0.03^-0.02_rho_J and 1,290^+20^-10_K, and 0.39^+0.02^-0.02_M_J_, 1.55^+0.10^-0.08_R_J, 0.11^+0.02^-0.02{rho}_J and 1,700^+40^ -40_K, respectively. Their host stars are early G type stars (with magV ~ 13) and their orbital periods are 4.53 and 3.33 days, respectively. WASP-156b is a Super-Neptune orbiting a K type star (magV = 11.6). It has a mass of 0.128^+0.010^-0.009_M_J_, a radius of 0.51^+0.02^ -0.02 R_J, a density of 1.0^+0.1^-0.1{rho}J, an equilibrium temperature of 970^+30^_-20_K and an orbital period of 3.83 days.

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