WordNet (r) 3.0 (2006):

spitting image
    n 1: a perfect likeness or counterpart

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "spitting image":
   Doppelganger, actual thing, carbon copy, companion, copy,
   dead ringer, ditto, double, duplicate, effigy, equivalent,
   exact counterpart, exact likeness, facsimile, fellow, homograph,
   homonym, homophone, icon, idem, identical same, idol, image,
   likeness, living image, living picture, match, mate, miniature,
   mirroring, model, no other, none other, photograph, picture,
   portrait, reflection, replica, resemblance, rubbing, selfsame,
   semblance, shadow, similitude, simulacrum, spit and image, synonym,
   the same, the same difference, trace, tracing, twin, very image,
   very picture, very same