"Number One Girl" is a song by New Zealand and South Korean singer Rosé. It was released on 22 November 2024 through The Black Label and Atlantic Records as the second single from her debut studio album Rosie (2024). The track was written by Rosé, along with Amy Allen and the song's producers Bruno Mars, D'Mile, Carter Lang, Dylan Wiggins, and Omer Fedi. It has been described as a sentimental pop-punk piano ballad, blending elements of soft rock. The lyrics explore themes of heartbreak, unrequited love, longing, insecurity, and vulnerability. Rosé wrote the song after being deeply affected by hateful comments online.
The single was accompanied by a self-directed music video, featuring a retro camcorder style. The video showcases Rosé wandering through various nighttime locations in Seoul, including the Jamsu Bridge, and a lookout, as she sings to an unnamed lover. Rosé debuted the song live on KBS2's The Seasons: Lee Young-ji's Rainbow on 29 November 2024. The song ultimately achieved moderate success, peaking at number 29 on the Billboard Global 200 and securing top-five positions in Hong Kong, Malaysia, Singapore and Taiwan. It also charted in countries such as Australia, Canada, South Korea, and the United Kingdom.
