  We study regularity of a hydrodynamic singular model of collective behavior
introduced in \cite{ST1}. In this note we address the question of global
well-posedness in multi-dimensional settings. It is shown that any initial data
$(u,\rho)$ with small velocity variations $|u(x) - u(y)| < \e$ relative to its
higher order norms, gives rise to a unique global regular solution which aligns
and flocks exponentially fast. Moreover, we prove that the limiting flocks are
stable.
