When ready to serve, discard foil and remove side of pan. If needed, run metal spatula along side of cheesecake to loosen before removing pan. In chilled medium bowl, beat whipping cream until soft peaks form; add marshmallow creme, and beat until blended and smooth. Fit decorating bag with 1/2-inch round piping tip; fill with cream mixture. Starting on outer edge of cheesecake, and using constant pressure on bag, pipe clockwise, working toward center and ending in a tall peak (use photo as guide). Decorate as desired. Store covered in refrigerator.