This study aims to examine the impact of celebrity endorsers and viral marketing on purchase interest in Scarlett Whitening beauty products, focusing on the beauty community in Singkawang City. Using a quantitative approach, data was collected through questionnaires distributed to a purposive sample of 100 customers and consumers. The independent variables are celebrity endorsers and viral marketing, while the dependent variable is purchase interest. T-test results reveal that both celebrity endorsers and viral marketing significantly influence purchase interest individually. Additionally, F-test results confirm that these factors collectively have a significant simultaneous effect on purchase interest in Scarlett Whitening beauty products in Singkawang City.