Justin Bieber has been making the rounds this week to promote his new album 'Believe', so you know he would end things off on his good friend Jimmy Fallon's show.

Bieber was trying to recover from an embarrassing moment on David Letterman's show where he called the Sistine Chapel the 16th Chapel.

In his defense though, the whole interview was fairly uncomfortable with Dave.  That's even more obvious when you see Bieber and Fallon talk to each other.  Things are great, until the competitive side get's the better of the two stars.

Jimmy Fallon Vs Justin Bieber