The ornamental design for a children's ride-on vehicle, as shown and described.
FIG. 1 is a top perspective view of an embodiment of a children's ride-on vehicle according to the present invention;
FIG. 2 is a front view of the children's ride-on vehicle of FIG. 1;
FIG. 3 is a rear view of the children's ride-on vehicle of FIG. 1;
FIG. 4 is a right side view of the children's ride-on vehicle of FIG. 1;
FIG. 5 is a left side view of the children's ride-on vehicle of FIG. 1;
FIG. 6 is a top view of the children's ride-on vehicle of FIG. 1; and,
FIG. 7 is a bottom view of the children's ride-on vehicle of FIG. 1.
The broken lines shown in the figures are included for the purpose of illustrating the unclaimed portions of the children's ride-on vehicle and form no part of the claimed design.