After Idol, Williams signed with Sony BMG Australia and enjoyed commercial success as a member of the Australian girl group Young Divas.
The group released two top-ten albums, Young Divas (2006) and New Attitude (2007), and achieved three top-fifteen singles, including the hugely successful "This Time I Know It's for Real".
[4] On 15 November 2005, betting agency Centrebet announced their final-week prediction that Williams would win the competition, with her odds at $1.36 and Kate DeAraugo at $3.00.
[6] In January 2006, Sony BMG Australia announced that William's had signed a recording contract with their label, and that she would release her debut album later that year.
In early 2006, Williams was asked by her record label to be part of a girl group concept, with previous Australian Idol contestants Paulini, Ricki-Lee Coulter and Kate DeAraugo, for a 17-date national tour to promote all four singers as solo artists.
[8][10] Following on from the success of their singles and tour, the Young Divas released their self-titled debut album, featuring remakes of disco classics, on 14 November 2006.
[13] In September 2007, it was revealed that Australian Idol season four runner-up Jessica Mauboy was the new member of the Young Divas replacing Coulter, who left the group to resume her solo career.
[8][12] In August 2008, it was announced that both Paulini and Mauboy had quit the Young Divas in order to resume their solo careers, leaving DeAraugo and Williams as the only remaining members.
[17] On 21 October 2010, she made a television appearance on Ready Steady Cook with fellow Australian Idol contestant Cosima De Vito.
[32] In 2013, Williams was featured on British rapper and The Valleys star Leeroy Reed's single "Can't Get Enough" and scored her second nomination at the PopRepublic.tv Awards for "Favourite Australian Female Artist".
[33][34] In January 2014, she was featured on Geordie Shore star Gaz Beadle debut single "Party Like a Rockstar (Up Your Game)" with UK group The Risk.
[50] In 2023, producers Michael Harrison and David Ian revealed that Emily Williams would play Rachel Marron in the UK tour of 'The Bodyguard' Musical.