Another TV alert Lovatics! Demi Lovato is set to appear on ‘Late Night with Jimmy Fallon’ which scheduled to air on Tuesday, September 3, 2013. Demi will be on the show to promote her upcoming new season 3 of ‘The X Factor’. Mark you calendar and check your local listing for actual airtimes. Also, Demi is also set to appear on Live with Kelly & Michael Show on that day. Be sure to catch it as well!