  Upsilon Andromedae is an F8V star known to have an extrasolar system of at
least 3 planets in orbit around it. Here we report the discovery of a low-mass
stellar companion to this system. The companion shares common proper motion,
lies at a projected separation of ~750 AU, and has a spectral type of M4.5V.
The effect of this star on the radial velocity of the brighter primary is
negligible, but this system provides an interesting testbed for stellar
planetary formation theory and understanding dynamical stability since it is
the first multiple planetary system known in a multiple stellar system.
