The British beauty split from advertising mogul Charles Saatchi in June (13) after photographs emerged showing him grabbing Lawson's throat during an argument over lunch at a London restaurant, and their divorce was given the green light last month (Jul13).
Saatchi's daughter Phoebe, who became Lawson's stepdaughter at the age of seven, has now accused the celebrated chef of cutting contact with her in the aftermath of the split.
The 18 year old tells Britain's Daily Mail newspaper, "Nigella has not spoken to me since she left our house on that Sunday when the newspaper story appeared. She has behaved in a very cold-hearted way. She has been my mother since I was seven or eight and has just abandoned me."
Mark Hutchinson, a spokesman for Lawson, says of Phoebe's statement, "We continue not to comment on personal matters."