The ornamental design for a kneepillow, as shown and described.
FIG. 1 is a perspective view of the knee pillow shown wrapped around a knee of a user so as to lie between the knees of the user, who is shown in broken lines;
FIG. 2 is a perspective view of the knee pillow with its knee enclosing flap closed;
FIG. 3 is a perspective view of the knee pillow with its knee enclosing flap open;
FIG. 4 is a front plan view of the knee pillow with its knee enclosing flap open;
FIG. 5 is a rear plan view of the knee pillow with its knee enclosing flap open;
FIG. 6 is a left side elevational view of the knee pillow shown in FIG. 3;
FIG. 7 is a right side elevational view of the knee pillow shown in FIG. 3;
FIG. 8 is a top plan view of the knee pillow shown in FIG. 3; and,
FIG. 9 is a bottom plan view of the knee pillow shown in FIG. 3.
In the drawings, the broken lines showing a user in FIG. 1 illustrates environment and forms no part of the claimed design. All other broken lines represent stitching.