Demi Lovato played a concert Saturday in Las Vegas as a part of her summer concert tour with Hot Chelle Rae. Demi's mom and little sister Madison were in attendance Saturday as Demi Lovato took the stage in Las Vegas.  Demi brought  her little sister Madison on stage for the song "Together." Madison talked about it on twitter, saying "That awkward moment when your sister calls you up to sing on stage and you almost die....", and "I'm shaking... That was the FIRST time I sang in front of Demi EVER in YEARS! Wow." People are raving about Madisons voice! I think she may have a future in music. What do you think?