Combine lemon zest, paprika, garlic, salt & pepper in a medium bowl, toss to coat.
In a large saute pan,, over medium high heat, melt butter, add shrimp and cook, stirring occasionally until pink and starting to curl 2 – 3 minutes. Transfer shrimp to a plate, set aside.
Add leeks, season with salt and pepper, cook over medium heat until leeks are soft and starting to brown on the edges, 4 – 5 minutes. Add beans and chicken broth and bring to a boil. Lower heat and simmer, 8 to 10 minutes. Stir in reserved shrimp and any juices, parsley and lemon juice, salt & pepper to taste. Serve with toasted bread or over angel hair pasta for a heartier meal.