Andy

Andy is a character introduced in Season 3 of Sonny with a Chance portrayed by Ariana Grande. She is a good friend of Sonny Munroe, having known her in Wisconsin. She claims they went to Willow Park Middle School and Springfield High. They only have fought about Chad Dylan Cooper, otherwise they get along perfectly. She makes her first appearance in the episode "Reunion with the Redhead". However, she doesn't appear in the series finale, so it's unknown whether or not she stayed in Hollywood.

Reunion with Sonny
Sonny and Andy had been classmates in high school before Sonny went to So Random! Hearing that Sonny and Chad broke up Andy went to see Sonny to comfort her. They are extremely happy to see each other. In the process she falls in love with Chad Dylan Cooper and earns a spot in a New TV Show.