Blessed? I'm counting them blessings! lol
I've never (knowingly) heard Bieber.
Likewise, I couldn't recognize Miley Cyrus if I heard her. Heck I can't even figure how to spell her name.
I think the last big pop hit I was familiar with was Lady Gaga's Pokerface - because of South Park.
That being said, I practically never leave home, we don't have a TV, I don't listen to radio.
I spent the biggest part of my time alone at home with our 5 cats for sole company, and I'm much much much better for it.
As far as I can tell, they dig Kiss and Black Sabbath... :)