The 30-year-old actress and her fiance Tom Sturridge welcomed their child into the world over the weekend in London, a source has confirmed to Us Weekly magazine.

However, details on the baby`s gender, name and weight have not yet been disclosed.

In May, the couple celebrated their child`s imminent arrival with a baby shower in London.

The pair were seen leaving the patty with a friend, who carried boxes which appeared to house cakes and balloons.

Sienna - who has been in a relationship with `The Boat That Rocked` actor for just over a year - revealed earlier this year she had taken up yoga to help her relax during her pregnancy.

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."
sections: Celebrities