Still promoting her Kmart line
, Dream Out Loud by Selena Gomez, the star
picks a laid-back look of jeans, booties and a striped top for an in-store appearance in Philadelphia.
06/23/2011 AT 05:00 PM EDT
drew thousands of admirers (and their parents!) to the Miami International Mall in Doral, Fla., on Tuesday, where she was promoting her new film, Monte Carlo
. "There were so many fans there you could hardly walk," a source tells PEOPLE. "It was amazing."