Add boiling water to combined gelatin mixes in medium bowl; stir 2 min. until completely dissolved.
Let stand at room temperature 30 min. to cool.
Beat pudding mix and milk in medium bowl with whisk 2 min. (Pudding will be thick.)
Add to gelatin; stir until blended.
Pour into 13x9-inch pan.
Refrigerate 3 hours or until firm. Dip bottom of pan in warm water 15 sec.
Cut into 24 decorative shapes using 2-inch heart-shaped cookie cutters, being careful to cut all the way through gelatin mixture to bottom of pan. Lift JIGGLERS from pan.