Frasier star Kelsey Grammer broke up with his wife over the phone, according to reports.

The 55-year old actor called Camille Donatacci over a month ago to tell her he "was done" with their 13 year marriage.

Citing irreconcilable differences, Camille filed for divorce earlier this month.

"Kelsey was so cold," a source told New York Post gossip column Page Six.

"He told her it was over and he wanted to see other people, but still asked her to be at the Tonys. She stayed at the London Hotel, and in public they acted like a couple, but he wouldn't let her in his apartment, or discuss a reconciliation.

"Some friends say he changed after he moved to New York five months ago.

"He started hanging out late with a new crowd after the show, and became more distanced from Camille. He was living the single life."