Don't cross Brandi Glanville!
After posting a pic -- just of her torso -- of herself wearing a pretty pink bra, one of her followers took exception and Glanville fought back.
"It's bras & undies I'm obsessed with all lingerie especially agent provocateur so if u have a prob with me GFU," she wrote.
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Glanville has been in Miami for promotional appearances, where she promised to wear some clothes over her favorite bra.