In a large pot, boil salted water. Add your pasta, and cook according to the package instructions for al dente. When the pasta is cooked, reserve 1 cup of pasta water and drain the pasta.
In a large skillet over medium-high heat, add 3 Tbsp butter. When the butter is foaming, add the garlic and lemon juice. Saute for about 2 to 3 minutes, until the garlic has softened. Add the shrimp. Saute until they cook through and turn pink, about 3 minutes. Remove shrimp from pan to a paper towel lined plate. Set aside.
In the same pan, melt the remaining 1 Tbsp butter. Add the heavy cream and with a spatula deglaze the pan. Add in some of the reserved pasta water and allow sauce to simmer, about 3 minutes, while whisking.
Toss the pasta with the sauce until it’s well coated. Add the shrimp back in to incorporate into the sauce, garnish with fresh lemon zest and basil or parsley. Serve immediately.