Jessica Alba and Gwyneth Paltrow may have attended Gwen Stefani's baby shower a few weeks ago, but they're far from besties!

On Friday Gwyneth posted a newsletter on her GOOP website titled "The Dirty on Getting Clean," and she slammed several products, including one from Jessica's Honest Company!

The Oscar winner wrote, "Many of the 'clean' products I proudly use (and have even touted on goop) have turned out to be a product of marketing, rather than actually safe. I will never give up my perfume, but maybe I can switch to greener and unscented laundry detergent, and remove some of the hand soaps I thought were great until I checked them on ... Food for thought."

Gwynnie then seemingly did a little copy and paste job from the Environmental Working Group (EWG), who show dozens of products and their "grades" -- and on their "What We Were Using" list, The Honest Company's All-Purpose Cleaner was given a "C" -- burn!

This isn't the first time the actresses have had a mini-spat though -- last year when she was promoting her book The Honest Life: Living Naturally and True to You, Alba told the New York Daily News, "Gwyneth Paltrow probably lives a very similar lifestyle, but I didn't grow up with a bunch of money, so my tips are much more grounded: repurposing things and making things at home."

Pepper Potts vs. Sue Storm? We're ready for the next round!