In a medium sized bowl (preferably square) spread bean dip in an even layer. In another add the sour cream, mayonnaise and taco seasoning mix, stir until well blended. Pour over the bean dip, cover and refrigerate at least 4 hours to allow the flavors to blend. When you are ready to serve top with diced tomatoes, black olives and cheese. Serve with tortilla chips or Sociables Crackers. Enjoy!