Monk was born in England, but her parents moved to Victoria Ave, in Lithgow, New South Wales, Australia before relocating to Australia's Gold Coast in Queensland. She also spent time at Somerset College, A. B. Paterson College and MacGregor State High School, where she was a school captain in her senior year (graduating in 1997) and was enlisted in the school's CAD Program.She trained in classical opera when she was growing up.
In 2002, Monk signed a recording contract with Warner Music Australia and started working on a solo album. The first single "Inside Outside" was released in October 2002 and was produced by Grammy Award winning music producer Rob Davis. Monk performed the song at the 2002 The Footy Show Grand Finale to promote the single. The track peaked at No. 5 on the ARIA Singles Chart and went on to sell over 35,000 copies worldwide. Her next single, "Get the Music On", peaked at No. 10 on the ARIA Singles Chart. On 5 May 2003 Monk released her debut album Calendar Girl which peaked at No. 35 on the ARIA Albums Chart. The album received mixed reviews from critics with Monk co-writing four of the albums tracks. Following the release of the album Monk released her third and final single, "One Breath Away", which peaked at No. 23 on the ARIA Singles Chart. In 2004, Monk parted ways with Warner Music.
In June 2007, Monk recorded a cover of "Push It" by Hip-Hop trio Salt-n-Pepa. The cover was recorded to promote Biofit Bra by Pleasure State which she is a spokeswoman for and was produced by her then boyfriend Benji Madden. Monk performed the song at a Biofit Bra launch in Catalina, Rose Bay. A promotional video was filmed and premiered as part of the ad campaign.