Britney Spears' friends and family are really concerned about the "dangerous" new group of people she's hanging around! Expressing their worry to Radar Online on Wednesday, a source shared: "The crew Britney is surrounding herself with right now is incredibly shady. A lot of these guys have criminal histories. Apparently, there are known drug dealers in the mix and other types that want to make a buck off her. These are exactly the type of characters her family always feared would take advantage of her and drag her back to rock bottom." Oh, no...