The 24-year-old singer and her dad spent five hours with ill children and their families at Hasbro Children's Hospital in Providence. She arrived unexpectedly, and local NBC news station WJAR-TV reports the star was unaccompanied by "press releases...cameras or an entourage."
The hospital confirmed the news on their Facebook page, and thanked the singer for her visit and her performance of "Mean" for their sixth-floor med/psych unit.
"We are so thankful to Taylor and her dad for choosing to spend time with us and put smiles on so many faces!" the Facebook post says.
The singer's appearance at Hasbro was her recent second hospital visit -- Swift had stopped by the Sloan-Kettering Cancer Center in New York to visit patients last week.
[Hasbro Hospital Facebook]