Marina Balmasheva and new husband Vladimir Shavyrin met he was just seven years old and she helped raise him.
The 35-year-old fell in love with him after he returned from university, and she later divorced his dad so they could be together.
Marina is a popular weight-loss blogger in Russia with more than half a million followers, after she lost eight stone and shared images of her “journey”.
She posted pictures of her daughter, whose name has not yet been announced, but said her toyboy husband instructed her not to show the girl’s face.
Her now ex-husband Alexey Shavyrin complained that she seduced his son.