The ornamental design for a hairformingdevice, as shown and described.
FIG. 1 is a front perspective view of my new design for a hair forming device in the open position.
FIG. 2 is a front side elevation view the hair forming device in the closed position.
FIG. 3 is a back side elevation view of FIG. 2, the power cord attachment location show in dotted lines is for illustrative purposes only and is not part of the claimed design.
FIG. 4 is a left side elevation view of FIG. 2, the right side elevation view is a mirror image.