In a large bowl, combine the chicken, apple, celery, walnuts, and grapes.
In a separate small bowl, whisk together the mayonnaise, sour cream, and lemon juice until smooth.
Pour the dressing over the chicken mixture and gently mix until everything is well coated.
Season with salt and pepper to taste.
Chill the salad in the refrigerator for at least one hour before serving to allow the flavors to meld.
Serve on a bed of fresh lettuce leaves.
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