Demi Lovato transitioned from acting to singing to make her UK chart debut in 2008 with Joe Jonas. The former Barney & Friends and Disney Camp Rock actress has since scored a handful of Top 10 singles in Britain; her 2012 hit Skyscraper was covered by X Factor winner Sam Bailey and became the UK's Official Christmas Number 1 single of 2013. Demi has also appeared as a judge on The X Factor USA.
