I claim the ornamental design for a cosmetic bottle, as shown and described.
FIG. 1 is a front elevation view of a cosmetic bottle of the present invention, the back elevation view being a mirror image of the front view;
FIG. 2 is a front perspective view of the cosmetic bottle of FIG. 1;
FIG. 3 is a right side elevation view of the cosmetic bottle of FIG. 1, the left side elevation view being a mirror image of the right side elevation view;
FIG. 4 is a top plan view of the cosmetic bottle of FIG. 1; and,
FIG. 5 is a bottom plan view of the cosmetic bottle FIG. 1.