We may not be the biggest Ariana Grande fans, as at times a permanent ponytail freaks us out.  But one thing that’s for sure is this girl can sing.  Really.  And if you ever thought otherwise, you may be shocked at her performance that’s going viral of Whitney Houston’s “I Have Nothing” while David Foster plays the piano like this is an everyday occurrence.  We’ve seen endless seasons of American Idol where everyone attempted this song and bombed time and time again.  Ariana killed it during her Honeymoon tour in Inglewood, CA the other night.  Take a look.