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We present multi-instruments and multi-wavelengths observations of the famousLBV star Pistol Star. These observations are part of a larger program aboutearly O stars at different metallicities. The Pistol star has been claimed asthe most massive star known, with 250 solar masses. We present the preliminaryresults based on X-Shooter spectra, as well as the observations performed withthe VLTI-AMBER and the VLT-NACO adaptive optics. The X-shooter spectrographallows to obtain simultaneously a spectrum from the UV to the K-band with aresolving power of $\sim$15000. The preliminary results obtained indicate thatPistol Star has similar properties of Eta Car, including shells of matter, butalso the binarity. Other objects of the program, here briefly presented, wereselected for their particular nature: early O stars with mass discrepanciesbetween stellar evolution models and observations, discrepancies with the windmomentum luminosity relation.

X-shooter, NACO, and AMBER observations of the LBV Pistol Star \footnote{Based on ESO runs 85.D-0182A, 085.D-0625AC}