Reese refusing to film sex scene with Vaughn

The pair have reportedly been clashing constantly on the set of romantic comedy Four Christmases and now Reese is refusing to roll around naked with Vince.

An on-set source told the New York Post newspaper: "Reese has an issue with the scripted love scene. It is meant to be a funny, 'American Pie'-style romp, full of bumps and laughs, but Reese is such a prude, she thinks it's just too much."

Despite being an Oscar winner and a more highly-paid Hollywood star, Reese is unlikely to win the argument as Vince is one of the film's producers.

The 37-year-old actor also oversaw much of the script writing, about a couple whose divorced parents do not get on, so they decide to celebrate Christmas separately with each of them.

It has previously been reported Reese, 31, has been unhappy with Vince's behavior on set.

While she is keen to work hard and film on schedule, he allegedly turns up to work hung-over, forgets his lines and is constantly fooling about on set.

Stay away from my man Aniston: Reese

Reese Witherspoon has reportedly warned former 'Friends' star Jennifer Aniston to stay away from her beau Jake Gyllenhaal, especially after the two shared a lingering kiss at an awards function recently.

A source revealed to Woman's Day magazine that the Oscar winner "broke down in tears" after seeing photographs of the kiss splashed on the covers of magazines, especially as she’s aware that Aniston is one of the hottest single women on the block.

"She always thought Jake was intelligent and charming. That's why she's so stunned by the photographs of Jake and Jen. She's really hurt by what she's seen. They seem to be very explicit and everyone knows Jennifer's looking for love," Contactmusic quoted the source, as saying.

"When Reese heard about it, she broke down in tears asking, 'Why would he do that?' She is very unhappy about it," the source added.

Reports emerged earlier this month that the actress, who split from hubby Ryan Phillippe last year after being married for seven years, has quietly been dating the fellow Oscar-nominee Gyllenhaal for the past two months.

As for how the two got together, well though they were both acquaintances from before - Jake was an old workout buddy of Phillippe – it was only when they were working together on their new movie CIA thriller 'Rendition', that nature took its course.

A source revealed to People magazine that what had started off as a "little flirtation", had developed into something more serious over time.

"Jake went and reintroduced himself to Reese. Things slowly progressed, but it was never something she thought would happen from the start. She just kind of developed this little crush over time," the mag quoted the source, as saying at the time.