"Best Friend's Brother" is a song performed by American pop recording artist Victoria Justice, billed as Cast of Victorious featuring Victoria Justice. It was produced by Kool Kojak, who also co-wrote the song with Savan Kotecha and Victoria Justice, for Victorious: Music from the Hit TV Show (2011), the soundtrack to the Nickelodeon television series, Victorious. It was released as the album's third single on May 20, 2011 through Columbia Records in association with Nickelodeon. Musically, the song runs through an electropop oriented dance beat with teen pop lyrics, and the lyrics speak of a girl's crush on her best friend's brother.

The song was met with generally positive reviews from critics, with the majority of them praising its message and aggressive sound. "Best Friend's Brother" charted on the Billboard Hot 100 at number eighty-six, remaining as the third highest peaking song from the soundtrack. The accompanying music video portrays Justice dreaming of attracting her best friend's brother while her best friend remains oblivious to the attraction.

"Best Friend's Brother" is the fourth single released from the soundtrack Victorious: Music from the Hit TV Show (2011), for the television series of the same name on Nickelodeon. It was first heard on the series's second season episode,"Prom Wrecker", which premiered on May 21, 2011 in North America, a day after the single's release. At the Avalon Theater concert night (where she also performed the song), Justice stated that the song was one of her favorites. The song was performed by Justice with backup vocals from Ariana Grande and additional instruments by Leon Thomas III in the episode. The scene where the song was performed features Justice, Grande and Thomas performing at the prom. While on the stage at the end of the episode, rain starts pouring down on them and they continue performing.

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