Thaw shrimp according to package instructions; reserve in refrigerator until ready to use.
Heat oil in a large skillet over medium heat. Add onions, garlic, salt, pepper, paprika and hot pepper flakes. Cook until golden, about 5 minutes. Stir in rice until grains are shiny and coated. Pour in tomato juice, broth and lemon juice; bring to a boil. Cover; reduce heat to medium and simmer 15 minutes.
Increase heat to medium and stir in corn and green pepper. Cover again and cook 5 minutes or until rice is tender. Stir in shrimp and cook,, covered, until heated through, about 2 minutes.
Let stand 5 minutesbefore serving. Squeeze lemon juice from lemon over rice and garnish with green onions.