Christmas came early for De Niro and Grace Hightower as they became parents to little Helen Grace - a younger sister for their 13-year-old son Elliot.
A representative for the Oscar winner confirmed the tot's birth to People.com on Friday (23Dec11), although further details were unavailable as WENN went to press.
The couple wed in 1997.
The Taxi Driver star has four other children - two grown up children from his first marriage to Diahnne Abbott, and 16-year-old twin boys with his ex-girlfriend Toukie Smith, also born via a surrogate mother.
The Oscar winner will be toasted at the Kennedy Center Honors ceremony this weekend, and he intends to make the event a family affair, with an entourage including his wife Grace Hightower, their ten-year-old son; his 13-year-old twin sons with ex Toukie Smith; his 33 year old son with Diahnne Abbott and their adopted daughter.
And he admits it was a struggle convincing White House staff to allow access to the whole De Niro clan.
The actor explains, "Well it's an honour, of course, and I'm taking all the kids and family.
"I've been going through a lot of problems trying to get them into the White House to meet Obama so I said (to the ceremony officials), 'Just get the kids in.' That's the bottom line."