Demi Lovato is full of surprises! On Dec. 3, the "Neon Lights" singer took over the stage at 99.7's Triple Ho Show in San Jose with UK singer Jessie J. The duo sang the hit Jessie sings with Ariana ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo Credit: John Nacion/Variety via Getty Images Demi Moore has floored her fans once again, but this time it is not her outfit ...