Fury cast Brad Pitt and Shia LaBeouf are currently portraying World War II soldiers in the soon-to-be completed film.

"Brad and Shia met many years ago and wanted to work together.  They searched a long time until they found the right project and both were enthusiastic about the World War II army thriller," according to an insider of RadarOnline.com

Unfortunately though, Brad Pitt, who's playing the role of a Sherman Tank crew leader during the World War II is not happy on the set because he is not having a good relationship with his co-star Shia LaBeouf.

According to a RadarOnline.com source, "Brad and Shia haven't formed a tight friendship during the making of Fury."

Fury cast Brad Pitt and Shia LaBeouf "have very different styles of working and it's not mixing well on a personal level," the source added. "Brad likes to enjoy himself on a set, but Shia is an incredibly serious guy when it comes to his performances."

It has been reported that Pitt, 49, despite being enthusiastic about the new film is disappointed about the 27-year old actor's extreme approach to acting.

The insiders revealed: "Brad is impressed by the performance Shia is turning in, but it's not helping their friendship for Brad to see how much torture Shia puts himself through to get results.

"Brad is a laid back guy who works completely differently from this kid."

It seems that Shia has burned bridges again, this is not the first time for the "Transformers" star to annoy a co-star. It was previously reported that the 27-year old actor was engaged in a Twitter war with "Orphans" Broadway co-star Alec Baldwin, when Baldwin dissed LaBeouf after he left the play.

Going back, the source told RadarOnline.com that Fury cast Brad Pitt is dismayed about Shia LaBeouf because he had no problems whatsoever, and had formed a tight friendship with his "Moneyball" co-star Jonah Hill, 29.

"Brad loves to joke around with his young co-stars," the insider revealed.  "And especially on a very serious war movie, he'd love to take the edge off by kicking back between scenes.  But Shia wants to stay in character the whole time."

Once the filming of Fury is concluded Brad Pitt will be heading to Australia to join his six kids and fiancé Angelina Jolie who is filming her movie "Unbroken."

Kpopstarz will keep you updated once representatives of both actors provide official statement regarding the issue.