CP Violation in Hadronic $B$ Decays at LHCb

The LHCb experiment is a general purpose forward spectrometer operating at the Large Hadron Collider, optimized for the study of B and D hadrons. LHCb collected 1.0 fb$^{-1}$ of integrated luminosity during 2011 data taking, which provides unprecedented large samples of B hadron decays. These decays offer many complementary measurements of CP violation which probe directly or indirectly the parameters of the CKM matrix. We present here first evidence and observations of CP violation in charged, neutral, and strange B mesons decays to hadronic final states.