Sarah Nicole Harding (17 November 1981 – 5 September 2021) was an English singer, model, and actress who rose to fame in late 2002 when she successfully auditioned for the ITV reality series Popstars: The Rivals, during which Harding won a place in girl group, Girls Aloud. The group achieved twenty consecutive top ten singles (including four number ones) in the UK, six studio albums that were certified platinum by the British Phonographic Industry (BPI), two of which went to number one in the UK, and accumulated a total of five BRIT Award nominations. In 2009, Girls Aloud won "Best Single" with their song "The Promise".

During the group's break, Harding began acting, appearing in Bad Day, the BBC television film Freefall, Run for Your Wife, and St. Trinian's 2: The Legend of Fritton's Gold. Harding contributed three solo songs to the soundtrack of St. Trinian's 2. She also modelled for Ultimo lingerie. In late 2012, she reunited with Girls Aloud to celebrate their tenth anniversary. In early 2013, they announced that they had split up. In 2015, the singer briefly appeared in Coronation Street, and released her first extended play record, Threads. She won Celebrity Big Brother 20 in 2017.

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Sarah Nicole Harding é uma cantora, compositora, atriz e modelo inglesa. Foi uma das vocalistas principais do grupo pop britânico Girls Aloud. Ganhou fama ao fazer o teste para o Popstars: The Rivals, em 2002. Sarah se juntou a Nadine Coyle, Cheryl, Nicola Roberts e Kimberley Walsh para a formação do grupo Girls Aloud, formada através da mostra por uma votação pública em 30 de novembro de 2002.

A estreia do grupo com o single "Sound of the Underground" chegou ao número um nas paradas britânicas, tornando-se em 2002 o #1 de Natal. Girls Aloud tem o recorde de menor tempo entre a formação de grupo e um #1. Desde 2003, Girls Aloud lançaram 20 singles adicionais, com quase todos dentro do top #10. Seus singles "I'll Stand by You", "Walk This Way" e "The Promise" alcançaram o número um. "The Promise" ganhou Melhor Single Britânico, no BRIT Awards 2009. O álbum de "The Sound of Girls Aloud" e o álbum de 2008, "Out of Control" entrou no UK Albums Chart no número #1, com mais de um milhão de exemplares a serem vendidos.

Em 2009, foi anunciado que o Girls Aloud iria pausa para se dedicarem a carreiras solo, em 2013, o grupo anunciou seu fim definitivo.