  We evaluate the contribution of scalar mesons to the hadronic light-by-light
piece of the muon anomalous magnetic moment, using a warped five-dimensional
model and holographic methods. We assess the contribution of the lightest,
sub-GeV scalars $\sigma(500)$, $a_0(980)$ and $f_0(980)$ together with their
associated towers of excited states, which the model generates automatically.
Our results point at a clearly negative contribution, overwhelmingly dominated
by the $\sigma(500)$ meson, that we estimate at $a_\mu^{\rm{HLbL,S}}=-9(2)\cdot
10^{-11}$. This number is in very good agreement with the most recent
determinations from dispersive analyses.
