There's no question this must be excruciatingly difficult on the entire family.
The source said:
[Image via FayesVision/WENN.]
ZOMG! Lovatics, take a deep breath!
But in case you haven't been on Twitter, we must inform you that Demi-corn tricked thousands of music fans by waltzing on stage during Jessie's hit Bang Bang and simply owned Ariana Grande's belty second verse!
We're not even joking when we say the slayage was ON POINT!
Of course, the crowd went bonkers and you can barely hear Miz Lovato in the beginning, but thankfully, someone captured the entire thing on camera for our viewing pleasure!
To which Jessie replied:
Gotta lurrrve pop stars in harmony! This was definitely a top stage moment of 2014!
Ch-ch-check out the bang banging' performance (below)!