Heat oil in large nonstick skillet on medium-high heat. Add celery and onion; cook and stir 5 minutes or slightly softened. Add chicken and sausage; cook and stir 5 minutes or until chicken is no longer pink.
Stir in Seasoning Mix, water, tomatoes and rice. Bring to boil. Reduce heat to low; cover and simmer 30 minutes.
Stir in shrimp; cover and cook 5 minutes longer or just until shrimp turn pink and rice is tender.