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We calculate all of the form factors for the one-photon, $K_L \rightarrow\pi^+ \pi^- \gamma^* \rightarrow \pi^+ \pi^- e^+e^-$ contribution to the $K_L\rightarrow \pi^+ \pi^- e^+e^-$ decay amplitude at leading order in chiralperturbation theory. These form factors depend on one unknown constant that isa linear combination of coefficients of local ${\cal O}(p^4)$ operators in thechiral lagrangian for weak radiative kaon decay. We determine the differentialrate for $\K$ and also the magnitude of two CP violating observables.

K_L to \pi^+ \pi^- e^+ e^-