The late actor's family and friends attended the event held on the Santa Monica Pier on Tuesday, reports the Daily Star.
Eulogies were given by art dealer Tony Shafrazi and country star Dwight Yoakam, who also performed. Hopper's first wife Brooke Hayward and daughter Marin also attended the ceremony.
The memorial came one day after the opening of an exhibition at the Museum of Contemporary Art in Los Angeles which showcased a collection of Hopper's artwork.
The show is said to contain over 200 pieces of sculpture, photography, art and painting, and serves as the "first comprehensive survey of Hopper's prolific work".
Museum director Jeffrey Deitch said of Hopper: "His fusion of artistic media has become an inspiration for the new artistic generation who often draw on performance and film as well as painting, sculpture and photography in the creation of their work."
Hopper died in May, aged 74.