Okaayy then.
So that no one else has to figure this out .. working backwards from the screen cap (thanks Google) ..
The name in the screen cap led to a YouTube video.
The video is of a 15yo guy, Jacob Whitesides, doing a cover of "Stars". 
It had landed in my Twitter timeline last night as a RT so now it's making sense. 

Except I don't get why KC seems annoyed . . . it's a pretty decent cover by a kid who seems like a fan. 
Back to Google ... 
Ah ha ..  JW is (was?) a contestant on a reality show (x-Factor) .. and has a fan base .. who, after doing some scrolling, it appears blasted a lot of tweets at Grace for her to watch JW's cover. 

<i>Now what?</i> .. who knows .. maybe Grace will see it and ask him to duet with her at a show ?  :D 

Full disclosure .. I clicked the link in the tweet I saw, liked what the kid had done, RT'd it too, and posted it as has been done with other covers.  And I still like what he did .. better than Ms Amanda's on The Voice. 
See what you all think . . . http://youtu.be/9eSGEyyX-vg