Add onions, celery, and carrots and olive oil to large stockpot on medium-high. Cook, stirring, 6-7 minute Add chopped garlic. Cook 2 min, until vegetables are tender.
Add all tomatoes; simmer about 10 minute Add stock; return to simmer. Season to taste with salt and pepper.
Add pasta. Simmer 8-10 min, stirring often, until pasta is firm but tender. Remove from heat.
Add sour cream to soup; fold in basil. Ladle into warmed bowls to serve.