She's accusing Bey of copying her signature beaded bob hairdo without so much as a thank you, prompting Erykah to repost the image with a mockingly curious "Hmmm" caption.

Fans, especially Beyoncé's, immediately took note of EB's allegation of a style jacking.

In fact, the Beyhive is so riled up, Erykah switched from IG to X, where she urged Jay-Z to come to her rescue, posting ... "Say somethin Jay. You gone let this woman and these bees do this to me??"

Tough position for her to put Hov in -- after all, that's his wife Erykah's insulting!!!

It's interesting for Erykah to single out on the hairstyle, because Beyoncé's alternate "Cowboy Carter" album cover art (for vinyl LPs) has a lot happening -- the singer poses in the buff, only covered in a sash with "Act II" and "Beyince," her cousin Angie's last name, stamped across the front.

Yet, Erykah's laser-focused on that hair.

Remember, Erykah also targeted Bey last year over hats she wore during her "Renaissance" tour, which she also thought ripped off her style.