The 26-year-old wore a necklace with letters spelling out 'Cory' when going out with a friend in El Lay, reported Aceshowbiz.
The Broadway star donned baggy gray pants, a V-neck black long-sleeved top, and ballet flats. She piled her hair in a high bun.
Monteith, 31, passed away on July 13 in a Vancouver hotel room. Autopsy revealed that he died from toxic combination of heroin and alcohol. A private memorial held on the Paramount studio lot was attended by 'Glee' castmates and executive producer Ryan Murphy.