The band, known for their hits "Counting Stars," "I Lived," and "All The Right Moves," stopped at Children's Hospital of Philadelphia Saturday.
They visited the Ryan Seacrest Foundation's Seacrest Studios at CHOP.
"Thanks @OneRepublic for spending your weekend with us at @ChildrensPhila! The patients had so much fun with you in #SeacrestStudios," the Ryan Seacrest Foundation tweeted.
In a photo posted to OneRepublic's Instagram account, band member Brent Kutzle is dressed in what appears to be a giant woopie cushion costume.
He wrote, "Toots Amaze! @childrensphila. Great day at the Children's Hospital of Philadelphia! Thanks for having us! - BK"
CHOP shared a photo of OneRepublic and gave their thanks for the guys stopping by.
"Big thanks to @onerepublic for visiting #seacreststudios at CHOP today!" the hospital wrote on Instagram.
OneRepublic went on to perform their show at the BB&T Pavilion in Camden.
"Thank U Philly / New Jersey - tonight was INSANE!" they tweeted.
Thank U Philly / New Jersey - tonight was INSANE! pic.twitter.com/g7eY4kxMm5— OneRepublic (@OneRepublic) July 23, 2017
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