Uma Thurman and Arpad Busson welcome a baby girl

It's a girl! Uma Thurman welcomes her third child

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UPDATED:

15:05 GMT, 16 July 2012

Kill Bill star Uma Thurman has given birth to her third child.

The 42-year-old and financier boyfriend Arpad Busson welcomed a baby girl yesterday, according to America's Us Weekly.

No other details were immediately available.

Baby joy: Uma Thurman, pictured in June, has give birth to a girl

Baby joy: Uma Thurman, pictured in June, has give birth to a girl

The Smash star has two other children – Maya, 13, and Levon, 10 – with her ex-husband Ethan Hawke.

Busson has two sons from his relationship with model Elle Macpherson – Arpad Flynn Alexander, 14, and Aurelius Cy Andrea, nine.

Uma and Busson, 49, began dating in 2007 and endured a brief split in 2009.

Sources say the pair were had not planned to start a family together, but are thrilled at the news.

Happy couple: Uma and Arpad Busson, pictured in 2009

Happy couple: Uma and Arpad Busson, pictured in 2009

'Uma was definitely not planning on having another kid. It was a surprise,' a source told Us Weekly in February.

'But she's over the moon about it, very excited.'

And Uma has made it clear that she's very much in love with Arpad.

She said last year: 'I have something
I would really like to express about my love life. I'm happier with it
now than I've been in many, many years. Yes I'm trying to have as
peaceful a personal life as possible.'

The couple celebrated their impending new arrival with a pink elephant-themed baby shower in New York in May.

Blended family: The couple with their children from previous relationships in March last year

Blended family: The couple with their children from previous relationships in March last year