Demi Moore is coming between Mila Kunis and Ashton Kutcher.

The 54-year-old beauty recently gifted her ex-husband a silver baby rattle from Tiffany & Co. ahead of the birth of his son — and sources reveal exclusively to Life & Style that Mila, 33, was bothered by the present.

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"Mila was extremely unhappy about it,” one insider says. “She thought it was a tacky thing to do.”

demi moore ashton kutcher mila kunis getty

The innocent gesture caused a rift between the married duo, who are just days away from welcoming a baby brother for daughter Wyatt, 2.

"Mila wants Ashton to make it known to Demi that there should be no more baby gifts or similar gestures,” the source says. But Ashton, 38, disagrees. “He told Mila he doesn’t have a problem with Demi’s gifts. He thinks it’s rather sweet, and doesn’t have any plans on telling Demi to stop!"

For more on your favorite celebrities, pick up the latest issue of Life & Style, on newsstands now! And scroll through the gallery below for a look at Ashton and Mila’s cutest moments.