Brad Pitt and Angelina Jolie are preparing to marry on New Year's Eve, according to reports.

A report in American magazine Life & Style also claims that Jolie is three months pregnant.

"When the actress returned to the set of The Good Shepherd in early December for a few days of reshoots after a two-month break, the crew immediately noticed a problem," a source told the magazine. "The costumes no longer fitted over Angie's suspicious bump.

"Her body had changed so much that her wardrobe had to be refitted to give her extra room in the tummy area. Several dresses had to be altered."

The report also claims that Angelina "nearly fainted" on more than one occasion while on set.

The insider added, "People on set were thinking, she's obviously pregnant."