A frothing device adaptable to a steam outlet for producing milk froth comprising a steam inlet, a milk inlet, an air inlet, a vacuum chamber adapted to receive steam, liquid milk and air therein, a restriction with a limited cross-section adapted for conducting the product there through at high velocity, an emulsifying chamber; the emulsifying chamber having an outlet for draining the product froth out of the chamber and a froth flow regulation system configured for breaking the kinetic energy of the froth stream and for changing its direction sufficiently so that the froth is gently delivered out of the device. The frothing device can be mounted on a coffee machine to deliver cappuccino upon a push of a button.