Bieber has not put out any music which has any long lasting umph to it. The only reason people cover him in concerts, I would assume, is to appease their young female fans. Since Taylor Swift's fans fit that description exactly I am not surprised that she has covered Bieber's Baby in concert before.

Her LA fans had a little surprise yesterday when Bieber came on stage to sing his song with Swifty. It's pretty horrible, but the girls in the front row got a nice view of his ass because his skinny jeans were riding down to his knees.

XOXO
Jes...