Spinach artichoke dip

8 ounces cream cheese, well softened
1/4 cup sour cream
1/4 cup mayonnaise
1 garlic clove, minced (1 teaspoon)
2/3 cup finely shredded parmesan cheese
1/2 cup finely shredded mozzarella cheese
Pepper, to taste
14 ounces quartered artichoke hearts, liquid drained and chopped
6 ounces frozen spinach, thawed, squeezed to drain excess liquid

Combine all ingredients and refrigerate.