Hairbrush

FIG. 1 is a top front perspective view of a hairbrush, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a right-side elevation view thereof; and,

FIG. 7 is a left-side elevation view thereof.

The broken lines shown in the drawings depict portions of the article that form no part of the claimed design.