He was also dressed in a pair of checkerboard Vans sneakers and a white baseball cap.
The two both utilized face masks to keep themselves protected from contracting COVID-19 ahead of the birth of their child.
The singer and her beau have been dating since last year; she was previously romantically involved with actor Evan Peters and musician Yungblud.
In June, Halsey and Aydin received matching tattoos during a shared trip to Joshua Tree.
The markings both read seeds, which led many fans to speculate that the two were planning on starting a family in the future.
Getting inked: Last June, the singer and her beau received matching tattoos during a shared trip to Joshua Tree