Scott Disick, 37, and model girlfriend Amelia Gray Hamlin, 19, during jewelry shopping trip in Miami

Scott Disick, and Amelia Hamlin, who flashes cleavage in black cardigan, shop for jewelry in Miami

Amelia Hamlin, 19, rocks a sheer floral bikini cover-up with boyfriend Scott Disick, 37, in Miami

Lisa Rinna comments on relationship between daughter Amelia, 19, and Scott Disick, 37