HEAT barbecue to medium heat. Place unwrapped cream cheese spread on 8-inch square sheet of heavy-duty foil; top with pesto, tomatoes and shredded cheese.
PLACE foil on barbecue; cover with lid. Grill 8 to 10 min. or until shredded cheese is melted and cream cheese is softened, but still holding its shape.
TRANSFER foil to platter. Serve spread with crackers.