A feud brewing between Hollywood’s Highest-Paid Actress and Jennifer Aniston’s ex is threatening to disrupt filming on the new film FOUR CHRISTMASES. Reese Witherspoon and Vince Vaughn co-star in the romantic comedy, but according to reports the shoot is being hampered by the pair’s arguments over Vince’s “laid back attitude toward work.”

A mole tells the New York Daily News: “Vince rolls onto set in the morning looking like he just came in from a night out, while Reese will arrive early looking camera-ready. “Then Reese tries to force Vince into blocking out each scene and running through their lines as Vince tries to convince her that he’s an ad-libber and wants to play around and see where the scene goes. “She’s a one-take perfectionist and Vince likes to try it a few different ways. Sometimes Vince will be standing behind her and he has this look on his face that he just wants to kill her!”