The Melrose Place actress became engaged to Jack Wagner in August after more than four years of dating. However, the pair recently cancelled the impending wedding.
"Jack and Heather are no longer engaged," Locklear's rep told Us Weekly.
Locklear was first spotted without her engagement ring at Monday night's premiere of The Twilight Saga: Breaking Dawn - Part 1.
The pair met on the set of the original Melrose Place, where they played a couple who faked their own deaths and moved to a remote island.
Locklear landed the lead in a CBS pilot titled The Assistants in March.