Heat skillet over medium high heat and add sausage, breaking it into small pieces with a wooden spoon. Once sausage is browned and cooked through, about 5 minutes, remove and set aside. Add onion, garlic, celery and pepper to the hot skillet and cook until just beginning to soften, about 3 minutes. Add cooked sausage, rice, tomatoes, chicken stock, paprika (if using), salt, and okra. Cover with a lid and cook until liquid has almost been absorbed and rice is just about cooked, about 17 minutes. Add shrimp and continue cooking until liquid is fully absorbed, and shrimp are pink.