Vickers said in an interview that she had been listening to "Under the Bridge" shortly before working on "My Wicked Heart" and had noticed but decided to ignore the similarities.
In January 2011, Vickers travelled to Los Angeles, United States, to co-write material with John Shanks and Diane Warren, and played her debut USA gig at Cherry Pop in West Hollywood (promoted via Perez Hilton).
The album charted at number 37 on the UK Albums Chart and reached the top ten on the UK Indie Chart.
On her first live show, Vickers sang U2's "With or Without You" and Michael Jackson's "Man in the Mirror", for which she received praise from Dannii Minogue, describing it as "box fresh", with Simon Cowell remarking she was "the one to beat".
The following week Vickers performed Charlie Chaplin's "Smile" and Blondie's "Call Me", which again received praise from the judges.
Vickers was selected for the live shows and was mentored by Cheryl Cole in the girls' category alongside Alexandra Burke and Laura White.
Vickers' live show performances attracted both praise and criticism; judge Simon Cowell likened her to Marmite, saying fans would either love or hate her unusual singing style, stating that he "loved it".
In 2009, Vickers signed a record deal with RCA Records and after touring with her fellow finalists from The X Factor, played the title role in a West End revival of The Rise and Fall of Little Voice.
Vickers' 2010 debut single, "Once", charted at number one on the UK Singles Chart and her debut album, Songs from the Tainted Cherry Tree, achieved number one status on the UK Albums Chart.
Her follow-up singles, "The Boy Who Murdered Love" and "My Wicked Heart", reached the top 40 and top 20 respectively.
Vickers' second album, Music to Make Boys Cry, followed in 2013, accompanied by the singles "Cinderella", "Music to Make Boys Cry", and "Mad at Me".
was released as the second single and charted at number 36 in the UK.