Fill large pot with salted water. Bring to a boil.
While the pasta water gets underway, begin sauce. In a small sauce pan over medium heat, melt butter. Add garlic and cook for two minutes. Then add in heavy cream and cream cheese. Heat until bubbling, but do not boil. Slowly add in Parmesan cheese while stirring. Mix until the cheese melts. Keep warm on low heat, stirring occasionally. Add salt and pepper to taste.
Once pasta water is boiling, place the fettuccine noodles in the boiling water. Boil for 11 minutes.
Once pasta is ready, drain, preserving some of the pasta water. Add Alfredo sauce to the pasta. Toss and add a splash of the reserved pasta water. Toss until mixed.
Serve sauced pasta and top with a sprinkle of Parmesan and parsley.