In a recent interview, U.S. gold medalist Missy Franklin says she returned a care package, sent from the pop star, full of T-shirts, pictures and posters.
The presents were sent after she won four medals in swimming during the London Summer Olympics.
"Huge shout out to @justinbieber for sending me all this amazing stuff! Thank you so much! Can't wait for the concert!" she tweeted along with a picture of the loot.
She says the gifts are considered a form of special treatment and could have jeopardized her status as an amateur athlete.