Selena Gomez is more that just a superstar singer. She’s also an amateur detective. The 27-year-old and her mother Mandy Teefey, 43, spent the weekend of Feb. 21-23 in Chicago to attend CrimeCon, where they took part in a CrowdSolve event to help solve a cold case murder. While they were in town, Sel and her mom took in some of the city’s sights, including a trip to Millennium Park, and Selena shared photos of their visit to her Instagram on Feb. 25.