LADY GAGA:
RIHANNA:
KELLY CLARKSON:
One of many other praises:
KATY PERRY:
MILEY CYRUS:
BRITNEY SPEARS:
"She's a very good judge! She toughens me up! Sometimes I listen to you and I'm like, 'Oh, God, I've got to be a little stronger.' She has such a sophistication about her, she's cooler than me."
http://www.mtv.com/news/articles/169...x-factor.jhtml
RYAN TEDDER on ONEREPUBLIC
"She came in and just ripped it," he recalled. "She, in pop music, has one of the biggest ranges, possibly the highest full-voice singer [that] I've ever worked with. "She can belt full voice like three octaves above middle C, it's just crazy, practically off the piano, how high she can go," the 'Counting Stars' singer explained. "And [she has] complete power and complete control. At the beginning she's singing the lowest note she's ever done, and by the end she's going as high as she's ever gone."
Source:
http://www.digitalspy.com/music/news...#ixzz2nhb9QJVb
SELENA GOMEZ:
Too many to count.
ZENDAYA:
Too many to count.
PETE WENTEZ of FALL OUT BOY:
“amazing when people put themselves into their art completely #np skyscraper by @ddlovato” on Twitter
ASHLEY TISDALE:
“Loving @ddlovato. Her voice is absolutely amazing.” on Twitter
CHYREL COLE of GIRLS ALOUD:
"@ddlovato I have just watched your Stay Strong doc and felt compelled to say I think you're so Strong, Brave and Beautiful inside and out. (sic)"
KELLY ROWLAND:
LEONA LEWIS:
CHER LLOYD:
One of many others:
"That girl can REALLY sing!"
http://www.digitalspy.com/music/news...ally-sing.html
....and many more others! But if you recall any other celeb, tell me and I'll add it to the roster of praise to Legend Demetria! 
