No other details were immediately available.
Uma Thurman, 42, has two other children – Maya, 13, and Levon, 10 – with her ex-husband Ethan Hawke.
Arpad Busson has two sons from his relationship with model Elle Macpherson – Arpad Flynn Alexander, 14, and Aurelius Cy Andrea, 9.
Uma Thurman and Arpad 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.
“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.”
Uma Thurman 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.
The US House Ethics Committee has voted to release its report on former Republican Representative…
ABC News has agreed to pay $15 million to President-elect Donald Trump to settle a…
South Korea’s parliament has voted to impeach President Yoon Suk Yeol over his failed attempt…
Israeli war planes have carried out more than 100 air strikes in Syria on December…
President-elect Donald Trump has threatened to impose 100% tariffs on the BRICS countries if they…
Syrian troops have withdrawn from the city of Aleppo following an offensive by rebels opposed…