The eldest daughter of Warren Beatty and Annette Bening is living as a young man after changing her name.
Kathlyn Beatty, 18, is now known as Stephen Ira and is said to be planning a sex-change operation.
According to reports in the U.S., Hollywood veteran Beatty, 73, is 'crushed' by his child's determination to change her gender.
Meanwhile Miss Bening, 52, who starred in American Beauty, is trying to support her daughter as best she can, despite finding the situation heartbreaking.
The National Enquirer reported that the teenager was currently attending college dressed as a man.
'Warren Beatty is beside himself over the situation with his daughter Kathlyn,' a source told the Enquirer.
'He and Annette have tried to deal with this over the years when their daughter was younger, but she's determined to go ahead with the transgender operation, just like Chastity [Bono].
'She repeatedly told her parents that once she turns 18 she would take matters into her own hands.'
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Bening remains close to Kathlyn but, although Beatty loves his daughter and vows not to turn his back on her, the experience is absolutely 'crushing him' according to the Enquirer.