Jacob Sartorius (born October 2, 2002; full name Rolf Jacob Sartorius) is a singer whose success on Musical.ly, a social media app that features short videos of lip-synced performances, helped launch his music career. In 2016, Sartorius released "Sweatshirt" as his debut single; he's also known for songs like "Chapstick" and "Hit Me Back." In 2018, he and Stranger Things actress Millie Bobby Brown went public with their romantic involvement. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.