I claim the ornamental design for the jean purse, as shown and described.
FIG. 1 is a front view of the jean purse.
FIG. 2 is a rear view of the claimed design.
FIG. 3 is a left side view of the claimed design.
FIG. 4 is a right side view of the claimed design.
FIG. 5 is a top view of the claimed design.
FIG. 6 is a bottom view of the claimed design; and,
FIG. 7 is an isometric view of the claimed design with the word “LOGO” appearing in dashed lines as environmental matter and of which forms no part of the claimed design.