Bring A Large Pot Of Lightly Salted Water To A Boil. Add Pasta And Cook For 8 To 10 Minutes Or Until Al Dente; Drain. Melt Butter In Large Skillet Over Medium Heat. Stir In Vodka And Red Pepper Flakes; Heat For 2 Minutes. Increase Heat To High, And Add Drained Tomatoes; Cook, Stirring To Break Up Tomatoes For 5 Minutes. Stir In Heavy Cream, Reduce Heat To Medium High, And Cook, Stirring For 5 Minutes, Or Until Sauce Thickens. Stir In Grated Parmesan Cheese Until Blended. Toss With Cooked Penne Until Evenly Coated.