"It is currently unknown if alcohol or drugs were a factor in the collision."Ms Syme and Reeves, 35, had preserved their privacy and never made their relationship public or commented on the loss of their baby.
Reeves' last big hit was The Matrix, where he starred alongside Carrie-Anne Moss, and his other films have included Speed and Dracula.
They were also photographed inside their car, with the Canadian star behind the wheel, trying to avoid looking at the camera.
Meanwhile, his date's face was not concealed and she was photographed giving a smile.
Take a look and if you wanted to know who the pop princess has dated, have a gander.