“Reese Witherspoon’s chemistry with a co-star is driving his fiancee crazy,” claims a piece in this week’s In Touch magazine.

Witherspoon is currently shooting her new film, This Means War, with Inception star Tom Hardy. And, according to the tab, Hardy’s fiancee Charlotte Riley is supposedly getting jealous that the “onscreen lovers’ friendship is blossoming off-camera as well.”

A so-called “source” for the tab says Riley flew to the Vancouver set to make sure Hardy “behaves himself.”

Her cause for concern?

“Reese and Tom listened to music and laughed between takes on November 11,” the mag reports, adding the co-stars “spend hours together every day.”

And…?

“They are genuinely having a great time filming this movie,” notes the “source.”

Wait!

They “spend hours together” and are having “a great time filming”?

Clearly, they are, you know…

Making a movie together.

That’s all.

An actual, reliable source on the set tells Gossip Cop that Star’s claims are “ridiculous.”

Witherspoon and Hardy are “professionals,” says the source, who further relates that they basically do their jobs, and then go home.

Ooh, scandalous!