I claim the ornamental design for a hair styling device, as shown and described.
FIG. 1 is a top plan view of a hair styling device in accordance with the
present invention;
FIG. 2 is a side elevation of the back side of the hair styling device
shown in FIG. 1;
FIG. 3 is a bottom plan view of the hair styling device shown in the
previous figures;
FIG. 4 is a side elevation view of the hair styling device taken from the
right side of the previous figures, the left side being the mirror image
thereof; and,
FIG. 5 is a side elevation view of the front side of the hair styling
device shown in the previous figures.