Electra, 40, who was supposed to wed Patterson four years ago, has reportedly ended her relationship with the Filter musician, reported Life and Style magazine.
"It is off. She has not been wearing her ring for a while, but they are good friends and it has been really hard for them to fully separate," a source said.
News of the split emerges a day after Electra was declared a celebrity contestant on new US TV dating show 'The Choice'.
"Carmen is really nervous about getting back into the dating pool, so keeping Rob around makes her feel less anxious about being single. It is not like they will get back together. The romance part is dead. They are done," the source added.
Electra was previously married to former basketball star Dennis Rodman and Jane's Addiction rocker Dave Navarro.