Tim McGraw -- Toronto Delivery?

Tim McGraw was absolutely stuffed after a dinner at Vaticano near Toronto ... and he proved it to photogs outside his hotel.

Tim and wife Faith Hill dined with country crony Reba McEntire for three hours -- and the father of three was feeling pretty darn perky afterward -- unveiling his belly for passersby and paparazzi. Make it four?

Just to see you smile.