In her original story in her Instagram Gigi Hadid used a type of shell pasta. It seems it is a smaller variety, more of an orecchiette (“little ears”) pasta type. You can use any shell pasta medium or large ill be good here. Other small pasta choices are fine too:  Fusilli, rotini, penne pasta, orecchiette, rigatoni, shell pasta, penne, farfalle (bowtie), conchiglie.