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In the presented paper exclusive decays $B_{c}\to J/\psi KK_{S}$ and$B_{c}\to\psi(2S)KK_{S}$ are analyzed. It is shown that contributions of theexcited $\rho$ mesons should be taken into account to describe these decays. Itis also shown that, unlike the corresponding $\tau$ lepton decays, peaks in$m_{KK_{S}}$ distributions caused by these resonances are clearly seen and canbe easily separated. Theoretical predictions for the branching fractions of thereactions and $m_{\psi K}$ distributions are also presented.

Excited $\rho$ mesons in $B_{c}\to\psi^{(')}KK_{S}$ decays