Heidi Montag's oversized chest is no longer an asset in Hollywood. Flatter-chested actresses like Astrid Berges-Frisbey are nabbing coveted roles in productions like Pirates of the Caribbean 4. Photo (2): Getty Images

There's a saying in California that Hollywood women have more plastic than a Toyota.

But things might be changing.

Just yesterday, Sharon Osbourne told the "Today" show's Matt Lauer that she is undergoing surgery in July to get rid of her 34DD breast implants, which she'll turn into paperweight gifts for rocker hubby Ozzy Osbourne. "They're better on his desk than on my chest," she said. "They're awful!"

Elsewhere in celeb land, oversize implants have been taking a beating under negative press -- and industry experts say it's a sign that the blown-up Barbie doll look is on its way out.

"The Hills" star Heidi Montag chose such large implants that she's medically not allowed to make them any bigger. Her transformation also drew jeers from fans and blogs, who thought Montag was sending the wrong message to teens.

And Amy Winehouse was rushed to the hospital last week due to complications from her 32D implants -- the second time the embattled singer has had issues with them.

Once considered a requirement for any actress looking to get a job, implants have now become a no-no -- casting directors for the fourth installment of "Pirates of the Caribbean" expressly forbid actresses with breast implants from auditioning. And if you think you can hide them, think again; the notice goes on to say there will be a "show and tell" test, which includes activities like running.

"I think the 'Pirates' story is indicative of a larger trend in Hollywood. Large implants, in my opinion, take the projects and the actors to a sleazier level. They become a joke," an anonymous L.A. female casting agent told the New York Post.

Casting agent Danny Roth agrees. Roth's latest film, Open House, debuts at New York's Tribeca Film Festival next week, and features an 'au naturel' cast of women, including Anna Paquin, Rachel Blanchard, and Tricia Helfer.

"If you're talented, let your talent speak for you. Rachel, our lead, has definitely relied just on talent. She's not well-endowed," says Roth.

Interestingly enough, it's often right now -- during the lull between awards season and the hot summer months -- when celebrities decide to go under the knife to reshape, inject, or perhaps now remove implants. We explain why here.

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