The singers are fulfilling one of 8-year-old Delaney Brown's wishes: a huge holiday sing-along outside her West Reading home. On her "Team Laney" Facebook page, a picture of Delaney giving two thumbs up was accompanied by the text, "I can hear you now!!! Love you!"
Delaney was diagnosed with a rare form of leukemia in May. Her family says earlier this week doctors gave her only days to live.
Supporters have been trying to fulfill a number of Delaney's wishes. She video chatted with singer Taylor Swift on Friday, her eighth birthday.