The ornamental design for a vehicletaillamp, as shown and described.
FIG. 1 is a front elevational view of a vehicle tail lamp, showing our new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a top, front and left side perspective view thereof; and,
FIG. 7 is a bottom, front and left side perspective view thereof.
The broken lines represent an internal boundary of the design; the line itself and the lighter gray shaded areas to the rear of the broken line form no part of the claimed design.