Taylor Swift has surprised an eight-year-old girl at the Phoenix hospital where she is recovering from devastating burns.

She showed up unannounced at the Arizona Burn Center to see Isabella McCune.

The girl's family made a video on Wednesday of her asking for Swift to visit because she couldn't leave the hospital for the singer's concert next week.

Swift stayed for about 20 minutes. She signed autographs and gave Isabella merchandise from her concert tour.

The McCune family says Isabella suffered third-degree burns over 65 percent of her body when a fire erupted at a neighbourhood party in March.

The girl says hugs sometimes hurt but asked for one from Swift.