  We demonstrate theoretically and experimentally coherence-induced
polarization changes in generic and higher-order vector vortex beams with
polarization singularity. The prominent depolarization on decreasing transverse
correlation-width in focused partially coherent vector vortex beam provides a
means to shape the intensity profile and the degree of polarization (DOP) while
preserving the polarization distribution. The intensity variation and DOP-dip
are found to be dependent on the polarization singularity index of the beam.
Our results may provide an additional degree of freedom in the myriad of
applications presently projected with various types of vector vortex beams.
