Star Magazine had this recent story about how Cameron Diaz is getting catty about Jennifer Lopez’s on set behavior. They’re co-starring in that sure-to-be crapfest What to Expect When You’re Expecting and allegedly have a mutual disdain for each other. Cameron is said to be more vocal about how much she dislikes Lopez while Lopez just totally ignores Cameron. I could see this happening, although it’s in Star so it’s possibly fiction.

“Jennifer and Cameron don’t like each other,” an insider tells Star. “They don’t interact much, but when they do, the tension is thick.”

The A-listers’ frosty relationship is particularly glaring because J.Lo, 42, has bonded with… other cast members [including] Brooklyn Decker [and] has also been linked to her on-screen mate, Rodrigo Santoro. “Cam sees all that stuff and hoopla around J.Lo’s divorce from Marc Anthony and whether she’s dating Rodrigo as a distraction from work,” says the insider. “She’s also annoyed by Jennifer’s huge entourage, which includes her mom, three assistants, makeup and hair people and her manager. She made a snide comment to the effect of, ‘How many people does it take for one woman to film a simple scene?’”

Cameron, 38, has even taken a shot at the acting skills of [J.Lo]… “She said Jennifer has a lot to learn and made a dig about how she’d be better off sticking to her day jobs – meaning singing and judging Idol…”

[J.Lo] “doesn’t seem to care,” says the insider. “She doesn’t talk about Cam or ask about her. She just acts as if Cam doesn’t exist.”

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