Watermelon Raspberry Smoothie

My dear friend, CL, had lots of frozen watermelon in her freezer and she needed to use it up.  So she made this absolutely delicious treat and shared it with me and my family.  Super easy and soooo delicious!
-2 1/2 cups watermelon
-1 cup raspberry sherbet
-some water
Blend watermelon, sherbet and ice.  Add water to thin out, if necessary.  Enjoy!