'The Voice' studio at the Children's Hospital of Philadelphia (CHOP) has been a popular place since it's grand opening two weeks ago. On Friday, two very exciting guests paid a visit to the multi-use media center, much to the surprise and delight of the young patients at CHOP. Miranda Cosgrove, from iCarly, and YouTube sensation Greyson Chance both stopped by 'The Voice' to talk with the children, pose for pictures, and do an interview on the hospital's closed circuit radio system. Of course, everyone at the hospital was ecstatic! Over one hundred people came to the studio, peering through the glass windows just to get a glimpse of the celebrities. During her interview, Miranda reflected on her career up until now. With major roles on Drake & Josh and iCarly, Miranda has definitely made her mark on the industry. Now that iCarly is over, she told the children at CHOP that she hopes to focus more on her music, giving them details about what it's like to travel on tour. Greyson Chance spoke about his whirlwind of a year since being discovered on YouTube, and how he finds the inspiration to write his own songs. He gave the kids tips on how to stay enthusiastic and motivated while pursuing music and songwriting. Greyson also revealed that he'll be making an appearance on the Disney television show, "Raising Hope." We know everyone at CHOP will be tuning in to watch! To top it all off, a few lucky families got tickets to see Greyson's concert at the Mann Center for Performing Arts in Philadelphia. From what we hear, the show was phenomenal! At the end of the day, both Miranda and Greyson stayed to sign every single autograph, making the patients at CHOP very happy and satisfied with their visit. Check back to ryanseacrestfoundation.org to find out which other celebrities will be visiting 'The Voice' studios in Philly and Atlanta!