Reduce heat to low and slowly whisk in cream. Simmer until sauce has thickened slightly, about 5 minutes.
Add pasta and toss to combine. If the sauce is too thick, add reserved pasta water, 1 tablespoon at a time, until sauce has reached desired consistency. Add Parmesan cheese and stir to combine.
Serve hot
Recipe by The Little Chef at http://littlechefblog.com/pasta-alla-vodka/