Backstreet Boys' AJ visited patients at children's hospital in Utah before concert

SALT LAKE CITY (KUTV) - The Backstreet Boys truly showed the shape of their hearts last night in Salt Lake City.

Before their concert at the Vivint Smart Home Arena, band member AJ McLean stopped by Primary Children's Hospital.

The singer visited with children and their families, according to a Facebook post published by the hospital.

He also sang a cappella for them and even invited a lucky fan to join him on stage.

"Thanks AJ and the @BackstreetBoys for stopping by today, the kids LOVED it," the post stated.

The Backstreet Boys ended their residency in Las Vegas in April and are currently in the middle of their DNA world tour.