She's the vocal powerhouse behind what is shaping up to be the song of the summer, but even Ariana Grande hasn't always felt confident.
"It's tough to spend some of the most important years of your life in front of so many strangers ...
GRANDE SAYS SHE FOUND STRENGTH IN HER GRANDFATHER, WHO DIED LAST WEEK. FAMILY IS A BIG PRIORITY FOR THE POP STAR, WHOSE BROTHER FRANKIE IS COMPETING ON BIG BROTHER.