Demi Lovato and David Walliams compare notes on Simon Semi-Final 3 Britain's Got Talent. <br /><br />Hey jealousy! David Walliams and Demi Lovato speak about Simon! We were expecting some BGMT fireworks putting David and Simon's X Factor co-host Demi ...<br /><br />Demi Lovato and David Walliams compare notes on Simon | Semi-Final 3 | Britain's Got Talent 2013<br /><br />Demi Lovato and David Walliams compare notes on Simon | Semi-Final 3 | Britain's Got Talent 2013
