For a non-alcoholic version, just substitute sparkling apple juice for the champagne.

3	cups	pineapple juice, chilled
¼	cup	lemon juice
1	qt.	pineapple sherbet
1	bottle	champagne, chilled

In punch bowl, combine pineapple juice and lemon juice.

Just before serving, scoop sherbet into punch bowl.

Carefully pour in champagne (it will foam).  Stir gently.

Leftovers, if any, can be refrigerated.