  We present the full two-loop four-graviton amplitudes in N=4,5,6
supergravity. These results were obtained using the double-copy structure of
gravity, which follows from the recently conjectured color-kinematics duality
in gauge theory. The two-loop four-gluon scattering amplitudes in N=0,1,2
supersymmetric gauge theory are a second essential ingredient. The gravity
amplitudes have the expected infrared behavior: the two-loop divergences are
given in terms of the squares of the corresponding one-loop amplitudes. The
finite remainders are presented in a compact form. The finite remainder for N=8
supergravity is also presented, in a form that utilizes a pure function with a
very simple symbol.
