"Official Girl" is a song recorded by American singer Cassie. It features vocals by American rapper Lil Wayne, who wrote his guest verse, while the original composition was written by members of collective The Clutch including Balewa Muhammad, Candice Nelson, Ezekiel Lewis, along with Marcella Araica and Nathaniel "Danja" Hills. Production was also handled by Hills. The song was first released for digital download in the United States on August 5, 2008, through Bad Boy and NextSelection in association with Atlantic Records, who then serviced it to rhythmic contemporary radio stations on September 22, 2008. The single was issued on vinyl as well with a promotional record being released that month.

Originally intended to be the first single from her second studio album, "Official Girl" is an R&B song, with the beat being referred to as "candy-floss production." Cassie stated the track stood out to her for its relatability with a good message and for being musically different. The song's lyrics consist of Cassie seeking status confirmation in a relationship as she is presented at a crisis between vulnerability and authority; she clarified its meaning as "standing up for what you want out of it." It garnered generally favorable reviews from music critics, who complimented its production and Cassie's delivery of the song's lyrical content.

The accompanying music video was directed by Chris Robinson and its concept revolves around Cassie's interpretation of the track's message, in which she grows frustrated over the uncertainty of a relationship with a man before deciding to break things off with him. The video's dance segments and styling generated Aaliyah comparisons. "Official Girl" debuted at number one on the US Billboard Hot Videoclip Tracks and the Norway Digital Songs charts, also topping MTV's Total Request Live countdown.

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