In a large bowl, whisk together the milk, sour cream, and ranch seasoning mix until smooth. Refrigerate while preparing the remaining ingredients.
Bring a large pot of salted water to a boil. Cook the farfalle according to the package directions until al dente.
While the pasta cooks, fry the bacon until crispy. Transfer to a paper towel-lined plate, allow it to cool slightly, then roughly chop.
Drain the cooked pasta well. While the pasta is still warm, immediately toss it with the prepared ranch dressing until evenly coated.
Allow the pasta to cool, then stir in the romaine lettuce, and cherry tomatoes.
Cover and refrigerate until completely chilled. Before serving add in the chopped bacon. Enjoy!