 After the detection of CoRoT-7b in the lightcurve, follow-up observations carried out with a network of ground-based telescopes ruled out nearly completely the possibility of a false positive detection.The HARPS spectrograph was subsequently used to measure the mass of CoRoT-7b with the radial velocity method.The strong activity of the host star, which perturbates radial velocity measurements, made the mass determination troublesome.