Article continues below advertisementBritney Spears' family is reportedly growing more worried after a recent viral video showed the pop star driving erratically. A source claimed the "Toxic" singer's loved ones are "terrified" she's "losing control," raising apprehensions about her mental health.Article continues below advertisement"There's a lot of concern. Everyone has always wanted the best for her, and she's showing right now that she's making bad choices," the insider told an outlet."It's terrifying," the source continued. "So there's a lot of talk about what to do, if anything.