Britney Spears is opening up about a painful cosmetic procedure gone wrong, revealing in an Instagram video posted Friday that a botched Botox injection left her left eyelid drooping for weeks, while also sharing an emotional message about guilt she carries as a mother. In the video, Spears, 44, pointed to the area around her left eye and described what happened during the procedure. "Girls, you have to be careful if you do Botox," Spears said. She extended the warning beyond just Botox specifically, urging fans to be cautious with any medical or cosmetic provider. Spears described being especially affected by a moment when one of her sons told her he didn't believe in God, and she apologized broadly for past mistakes.