The meeting was the result of an online campaign that Roser's parents tarted called "Healing Hailey" following a brain tumor diagnosis in August. After seeing the campaign, Milwaukee radio station ENERGY 106.9 supplied Roser and her family with meet-and-greet tickets backstage to meet the pop star and helped orchestrate getting Roser from the hospital, to the venue.
Roser, who has been undergoing chemotherapy, was given clearance from her doctor to attend the gig, and she posed for pictures with Bieber shortly before he took the stage.
A message on Roser's fundraising Twitter page reads, "I am so exited for Hailey right now, she met Justin Bieber!!! She deserved every second of it! Thank you."