  We report continuous direct photoassociative formation of ultracold KRb
molecules in the lowest vibrational levels $(v"=0 -10)$ of the electronic
ground state $(X ^1\Sigma^+)$, starting from $^{39}$K and $^{85}$Rb atoms in a
magneto-optical trap. The process exploits a newfound resonant coupling between
the $2(1), v'=165$ and $4(1), v'=61$ levels, which exhibit an almost equal
admixture of the uncoupled eigenstates. The production rate of the
$X^1\Sigma^+$ ($v"$=0) level is estimated to be $5\times10^3$ molecules/sec.
