  Measurements of $K_S^0$ and $\Lambda^0$ production in $t\bar{t}$ final states
have been performed. They are based on a data sample with integrated luminosity
of 4.6 $\mathrm{fb}^{-1}$ from proton-proton collisions at a centre-of-mass
energy of 7 TeV, collected in 2011 with the ATLAS detector at the Large Hadron
Collider. Neutral strange particles are separated into three classes, depending
on whether they are contained in a jet, with or without a $b$-tag, or not
associated with a selected jet. The aim is to look for differences in their
main kinematic distributions. A comparison of data with several Monte Carlo
simulations using different hadronisation and fragmentation schemes, colour
reconnection models and different tunes for the underlying event has been made.
The production of neutral strange particles in $t\bar{t}$ dileptonic events is
found to be well described by current Monte Carlo models for $K_S^0$ and
$\Lambda^0$ production within jets, but not for those produced outside jets.
