We hear things are anything but “All Love” on the set of the upcoming feature Valentine’s Day. Overgrown prankster Ashton Kutcher is rumored to be feuding with co-stars Jessica Alba and Topher Grace — creating a workplace nightmare for the film’s cast and crew and prompting a sharp tongue-lashing from wife Demi Moore — sources tell Globe’s Loosch Lips Column.

“His infantile behavior is making for a very a awkward atmosphere,” says one production assistant, who asked not to be identified.

According to new reports, Ashton has branded Jessica a “stuck up snob” after failing to hit it off with the beauty during filming. In addition, Ashton’s accused of effectively disowning Topher, his former co-star on the FOX comedy That ’70s Show, after learning the actor is producing ABC’s television remake of Demi’s classic 1985 flick St. Elmo’s Fire, currently in preproduction.

“Ashton is jealous because he tried to do the same thing a couple of years ago,” the insider explains. “Ashton gets so angry, he won’t even look Topher in the eye or say his name out loud, instead he passes messages to him through other people.

At least one person isn’t amused by Ashton’s alleged workplace temper tantrums, his wife Demi. The 46-year-old star has warned her hubby that Hollywood isn’t the kind of town where you want to burn bridges.

“Demi told Ashton it’s time to grow up and demanded he stop acting like a big jerk if he wants to earn respect in the industry.”