Electroweak penguins with di-leptons at LHCb

The studies of angular distributions and differential branching fractions of the decays $B^0\rightarrow K^{*0}\mu^+\mu^-$ and $B_s^0\rightarrow\phi\mu^+\mu^-$ are presented. They are complemented by the evidence of the $B^0\rightarrow K^{*0}e^+e^-$ decay for events with the $e^+e^-$ invariant mass between 30 and 1000 MeV$/c$. The presented results are based on the data sample collected by the LHCb experiment, which corresponds to an integrated luminosity of 1.0 fb$^{-1}$. Where predictions exist, all obtained result are consistent with the Standard Model and put strong constraints on the $b\rightarrow s$ flavour changing neutral current processes.