Nicola Maria Roberts (born 5 October 1985) is an English recording artist, fashion designer, and songwriter. After auditioning and successfully completing the reality television series and competition Popstars The Rivals, Roberts became part of girl-group Girls Aloud. Their debut single "Sound of the Underground" topped the UK Singles chart. This success helped them win the competition and they were later entered in Guinness World Records as the most successful reality television music-group.