How did you spend your weekend? Watching true crime documentaries on Netflix and chilling? Well, Selena Gomez was quietly at work with other amateur sleuths working to solve a real-life cold case at CrimeCon Chicago. Gomez and her mother, Mandy Teefey, attended the convention's CrowdSolve event, CrimeCon confirmed on its Instagram today, sharing a photo of Gomez hard at work."We were honored to host @selenagomez and her mom @mandyteefey at CrowdSolve this weekend," CrimeCon wrote.