  We explore the effects of Higgs mixing in the general next-to-minimal
supersymmetric Standard Model (NMSSM). Extended to include a gauge singlet, the
Higgs sector can naturally explain the observed Higgs boson mass in TeV scale
supersymmetry without invoking large stop mixing. This is particularly the case
when the singlet scalar is light so that singlet-doublet mixing increases the
mass of the SM-like Higgs boson. In such a case the Higgs mixing has
interesting implications following from the fact that the higgsino mass
parameter and the singlet coupling to Higgs bilinear crucially depend on the
Higgs boson masses and mixing angles. For the mixing compatible with the
current LHC data on the Higgs signal rates, the higgsinos are required to be
relatively light, around or below a few hundred GeV, as long as the heavy
doublet Higgs boson has a mass smaller than about 250\sqrt{\tan\beta} GeV and
the singlet-like Higgs boson is consistent with the LEP constraint. In
addition, the Higgs coupling to photons can receive a sizable contribution of
either sign from the charged-higgsino loops combined with singlet-doublet
mixing.
