Spies working on Reese Witherspoon and Vince Vaughn's new film, "Four Christmases," say the tension between the stars is even more entertaining than the script of the romantic comedy.
Famously alpha personality Reese — who named her production company Type A Films — is clashing with Vaughn's laid-back approach to work.
"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," says our San Francisco source. "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."
However, the movie, about a married couple who spend a Christmas with each of their four divorced parents, remains on schedule and on budget.
"She's a one-take perfectionist and Vince likes to try it a few different ways," snickers our snitch. "Sometimes Vince will be standing behind her and he has this look on his face that he just wants to kill her!"
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