Two HUGE music stars are coming together and we are going to LOVE IT! <br /><br /><br /><br />Demi Lovato is set to duet with Christina Aguilera at the 2018 Billboard Music Awards.<br /><br /><br /><br />The 'Tell Me You Love Me' singer and 'Beautiful' hitmaker have confirmed they are to give their new single 'Fall In Line', <br /><br /><br /><br />which features on Christina's new record 'Liberation' - its live debut at the annual ceremony.<br /><br /><br /><br />It follows Janet Jackson being announced as the recipient of this year's Icon Award.<br /><br /><br /><br />The 'Nasty' hitmaker will also sing for what will be her first televised performance in nine years.<br /><br />
