Drell-Yan production in the forward region with LHCb

We report on Drell-Yan production using data collected at the LHCb experiment with a centre of mass energy of $\sqrt{s}$ = 7 TeV in 2010. Drell-Yan events are selected with invariant di-muon masses $M\mu\mu > 5GeV/c^{2}$ in the pseudorapidity range $2 < \eta < 4.5$ and a transverse momentum $P_T > 3 GeV/c$. These measurements are sensitive to Bjorken-x values as low as $10^{-5}$ and provide important input to the knowledge of the parton density functions. The cross-section is measured as a function of the invariant mass and rapidity of the two muons.