Adam Levine, Kelly Clarkson stop by CHOP

From left: Adam Levine, two lucky fans, James Valentine, and Kelly Clarkson at the Seacrest Studios in Children's Hospital of Philadelphia. (Twitter)

It was a sweet surprise for a lucky group of kids at the Children's Hospital of Philadelphia on Wednesday.

Kelly Clarkson, Adam Levine and James Valentine stopped by CHOP's Seacrest Studios yesterday afternoon for a meet-and-greet with the hospital's young patients. The Idol winner and Maroon 5 were in town ahead of their scheduled show at the Susquehanna Bank Center that evening.

"Ya'll are some classy folks @kelly_clarkson @adamlevine @jamesbvalentine...thx for visiting @ryanfoundation," Ryan Seacrest tweeted later along with a photo.

The artists graciously took time out of their busy schedules to field questions from kids and pose for pictures. Clarkson shared the following image on her Instagram shortly after her visit at 3 p.m.