Jennifer Aniston reportedly wept in front of her boyfriend Vince Vaughn when she heard about the birth of her ex-husband Brad Pitt's baby daughter Shiloh Nouvel.

Aniston, 37, tried to be brave about the news, which broke two weeks ago, by calling Pitt's mother Jane to send her best wishes.

But pals are concerned the former Friends star is still traumatised over Pitt's new life with Angelina Jolie.

Aniston's friend Tiffany Laws tells British magazine Star, "Jen just burst into tears."

"She tried to cover it up in front of Vince but he assured her it was OK to cry."

"Jen called Brad's mom to offer her congratulations but couldn't get through."

"I think she had the feeling, 'That could have been my baby.'"