The ornamental design for a hairstraighteningbrush, as shown and described.
FIG. 1 is a top perspective view of a hair straightening brush, according to a first embodiment;
FIG. 2 is a top plan view of the hair straightening brush shown in FIG. 1;
FIG. 3 is a bottom plan view of the hair straightening brush shown in FIG. 1;
FIG. 4 is a side elevational view of the hair straightening brush shown in FIG. 1, with the other side elevational view being a mirror image;
FIG. 5 is a front elevational view of the hair straightening brush shown in FIG. 1; and,
FIG. 6 is a rear elevational view of the hair straightening brush shown in FIG. 1.
Any combination of the illustrated features, including claimed features and non-claimed features, may be claimed in this application or a continuing application claiming priority to this application by converting any portion of the broken lines to solid lines, any portion of the solid lines to broken lines, or both.