Svetlana Ilvina, 45, started a blazing row with hubby Anatoly, 47, and refused to accept his apology.
Instead she waited until he had gone to sleep then stabbed him repeatedly in the chest at their home in central Russia.
She then called the police and handed herself in.
A police spokesman said: "The couple had only been together three months and when the victim called his wife Olga, which is the name of his former wife, she decided she couldn't forgive him."
Ilvina now faces life in prison.
