  We prove that the half-BPS Wilson loop operator of N=4 SYM in a symmetric
representation of the gauge group has a bulk gravitational description in terms
of a single D3-brane in AdS_5xS^5, as argued in hep-th/0604007. We also show
that a half-BPS Wilson loop operator in an arbitrary representation is
described by the D3-brane configuration proposed in hep-th/0604007. This is
demonstrated by explicitly integrating out the degrees of freedom on the
D3-branes and showing that they insert a half-BPS Wilson loop operator into the
N=4 SYM path integral in the desired representation.
