The 83-year-old Oscar winner if going to be a dad for a fourth time with his 29-year-old girlfriend.
The actor's rep confirms to ET that Alfallah is eight months pregnant with what will be the Oscar-winning actor's fourth child.
Pacino and Alfallah -- who have a 54-year age gap between them -- have been publicly linked since last year when they were spotted exiting a restaurant in Venice, California, together and leaving in the same car.
More recently, the couple was on hand to celebrate director Bennett Miller's art exhibition at the Gagosian Gallery in New York City this past April. Alfallah wore a loose-fitting black shirt and slim black pants with an open blue jacket, concealing any signs of a baby bump while positioning her body behind Pacino's arm.
This is Alfallah's first child, while Pacino is dad to three adult children -- 33-year-old daughter Julie Pacino, from his previous relationship with Jan Tarrant, and 22-year-old twins, Olivia and Anton Pacino, from his relationship with Beverly D'Angelo. Additionally, actress and model Camila Morrone refers to Pacino as her stepfather after he dated her mother, Lucila Solá, for a number of years.
Prior to Pacino, Alfallah was in relationships with 79-year-old Rolling Stones frontman Mick Jagger, as well as 61-year-old billionaire investor Nicolas Berggruen. At one point, she was rumored to be connected with 93-year-old Clint Eastwood, although she told The Daily Mail that they were simply family friends.
"Noor comes from a very well-off family and is mature for her age. She has had a lot of life experiences due to her upbringing," a source tells ET of Pacino's girlfriend and the mom-to-be. "She grew up in Los Angeles and has always been well connected and part of a fast scene when it comes to the people she spends times with, the places she travels, and so on."
The source adds of Alfallah, "She has genuinely just been attracted to older men ever since she began dating. She is creative and has been pursuing a career in the entertainment industry for quite some time and is a sweet, fun girl."
TMZ initially reported the news.
Meanwhile, Pacino's longtime friend and co-star, 79-year-old Robert De Niro, welcomed a new baby, his seventh child, with girlfriend Tiffany Chen in April. For more on that baby news, check out the video below.