11-year-old Brenna Bercegeay is fighting AML Leukemia, but even a face mask didn't stop this budding star from belting out alongside Memphis Tigers quarterback Jacob Karam. Bercegeay, who is being treated at Target House at St. Jude Children's Research Hospital in Memphis, Tennessee, heard music coming from downstairs and ran down to find out what all the commotion was, when she found Karam playing piano. So, the cancer patient sat down beside him and the two began performing together. According to Bercegeay's mom, "She didn't want to stop... This was one of the 10 songs she sang with him. I hope next time she won't have to wear the mask. We even got invited to watch a game."