  We calculate electromagnetic properties of the decuplet baryons in quenched
and partially quenched chiral perturbation theory. We work at next-to-leading
order in the chiral expansion, leading order in the heavy baryon expansion, and
obtain expressions for the magnetic moments, charge radii, and electric
quadrupole moments. The quenched calculation is shown to be pathological since
only quenched chiral singularities are present at this order. We present the
partially quenched results for both the SU(2) and SU(3) flavor groups and use
the isospin limit in the latter. These results are necessary for proper
extrapolation of lattice calculations of decuplet electromagnetic properties.
