The 19-year-old actress stayed close by her 18-year-old beau as they walked inside.
“Do something nice for someone else today,” tweeted Justin. “U know your truth…do it for the right reasons.”
He later added, “Always need to mentally prepare myself for these children hospital visits. Really excited though.”
In case you missed it, make sure you check out Justin on the latest cover of Rolling Stone magazine, which hits stands this Friday (July 20).