Prepare pearl couscous according to package directions.
In large pot, bring broth to boil. Add carrots, celery and garlic. Reduce heat to medium-low and cook 5 minutes until vegetables are slightly tender.
Add chicken and Italian seasoning; simmer 5 minutes. Add pearl couscous and cook 5 minutes. Season with salt and pepper.
Ladle soup into four bowls and squeeze fresh lemon wedge into each bowl. Garnish with Parmesan and parsley.