The couple, who had said they would tie the knot in late September, have organised a bash at Chateau Miraval in Marseille in the south of France to celebrate 50th wedding anniversary of Pitt's parents Jane and Bill, but people think this can be D-day for the celebrated couple.
"Brad flew in to oversee preparations but they're all here now. They say it's for Jane and Bill, but some think this could be it. Even Angelina's private jeweller is here," thesun.co.uk quoted a source as saying.
The wedding list does not have more than 20 people, and it includes Pitt's best pal actor George Clooney, who has not arrived yet and there could be no way that the ceremony would happen without him.
"He's at his house in Italy, but could fly to Marseille in an hour. There's a real buzz around the estate," a source said.
Guest at the bash for Pitt's parents also includes Jolie's private jeweller who made her engagement ring.
Pitt, 48, recently bought Jolie, 37, a $390,000 watch as a pre-wedding gift.