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Justin Bieber's Beliebers are growing up.  The star is raising eyebrows for a photo he posted on his Instagram page over the weekend.  The photo showed a bra, presumably belonging to a fan, that was thrown onstage at one of his concerts. 

The 19-year-old posted it along with the caption, "I guess everyone grows up."  It's unclear when the photo was taken, as Bieber is currently on a break from his "Believe" tour, which is set to pick back up in the U.S. starting June 22nd. 

Meanwhile Bieber is having some more grown up problems of his own.  Earlier this month, he was accused of recklessly driving in his California neighborhood and just last week his bodyguards were accused of attacking a paparazzi in Miami. 

The star has since tweeted that he's really focused on writing new music, after announcing that his single called "Heartbreaker" will be coming soon. 

Photo Credit Getty Images & Instagram