British actor Jude Law's ex-wife, Sadie Frost, was reportedly angry to learn of her ex-husband's engagement plans from the former couple's 8-year-old son.

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Law, star of "Alfie" and "Closer," apparently told his son, Rafferty, of his plans to marry actress Sienna Miller. Rafferty then relayed the news to Frost on Christmas Day, the World Entertainment News Network reported Monday.

Britain's Daily Mail quoted a source as saying Frost called Law an expletive when she heard the news.

The source comments: "He spent the afternoon with the family and could have taken Sadie aside at any time to tell her that he was engaged, but he didn't. When Sadie spoke to Rafferty that evening, he told her the news. 'Dad's engaged to Sienna,' he said. She and Jude then had a furious row over the phone. She was very sarcastic and said something like, 'Well done. You could not have let me know in a better way than through our child.'"

Frost has since issued a statement saying she is "delighted" for her Law and his fiancee.