The model, married to Justin Bieber, had seen comments that she was trying to hide a baby bump under her gown at Sunday’s Grammy Awards.
She took to Instagram with a simple, “I’m not pregnant leave me alone.”
Bieber attended the Grammys with her husband, who was up for eight awards.
“They found I had suffered a very small blood clot to my brain, which caused a small lack of oxygen,” she told fans. “But my body had passed it on its own and I recovered completely within a few hours.”