  We suggest a plausible interpretation for the twin kiloHertz quasi-periodic
oscillations (kHz QPOs) in neutron star low-mass X-ray binaries. We identify
the upper kHz QPO frequencies to be the rotational frequency and the lower kHz
QPOs the standing kink modes of loop oscillations at the inner edge of the
accretion disk, respectively. Taking into account the interaction between the
neutron star magnetic field and the disk, this model naturally relates the twin
QPO frequencies with the star's spin frequencies. We have applied the model to
four X-ray sources with kHz QPOs detected simultaneously and known spin
frequencies.
