* "So Random!" is a fictional show within the "Sonny with a Chance" universe. While the characters and set were real, the show within the show doesn't have an official "first" performer.
* The series premiered on February 8, 2009, with the "So Random!" segment already established. There's no specific record of the first performance, only the first episode of the show as a whole.
However, we can make some educated guesses:
* The show's premise centered around a group of teenagers performing skits and songs. It's likely the "So Random!" cast performed in the first episode, which featured a combination of original skits and musical acts.
* Demi Lovato, the star of "Sonny with a Chance," was also a member of the "So Random!" cast. She may have been featured in the first performance, but it's impossible to confirm without specific episode information.
Ultimately, the first "So Random!" performance isn't documented in a way that allows us to definitively name the performer. It's likely one of the show's core cast members, but without specific episode information, it remains a mystery.