Heat grill to medium-high heat.
Shape ground beef into 8 (1/4-inch thick) patties. Top each of 4 patties with 4 Singles pieces and 1/4 of the bacon. Cover with remaining patties; pinch edges together to seal.
Grill 6 to 7 min. on each side or until done (160ºF).
Spread bottom halves of buns with cream cheese spread; top with lettuce, tomatoes and cheeseburgers. Cover with tops of buns.