Sienna Miller has named her newborn baby daughter Marlow.
The 'Factory Girl' actress - who gave birth to her first child with fiancé Tom Sturridge last weekend - has remained tight lipped about the arrival, but according to E! News the tot has been given the moniker Marlow.
The weight of the baby is still not known.
Sienna - who famously enjoyed an on/off relationship with Jude Law - has largely remained quiet about the arrival because she didn't want to jeopardise her recent attempts to keep her private life out of the public domain.
Speaking in March, she said: ''I'm in my second trimester, so I'm I-can-talk-about-it pregnant, even though I'm under strict instructions not to say anything as it would completely defeat the point of everything I've tried to achieve in the last eight years.''
The 30-year-old beauty also revealed she had taken up yoga in a bid to help her relax while pregnant.
She said: ''I have been trying to do some pregnancy yoga as I'm definitely not a gym person.
''My mum started up one of the first yoga schools in London in the 70s, so I should probably use her expertise as I have really bad posture. But I think I'd probably kill her if she tried to tell me to sit up straight.''