Have listened to pop star song by Dj khaled?
Are you referring to the song "Im the one" that also featured Quavo, Chance The Rapper and Lil Wayne? 
The one featuring Justin Bieber and drake
Yes the song Popstar is a very popular song.
I like it much. The message in that song is clear
Yes it does share a very clear message. Also the song that Justin did with Ed has a Valued message.