Rihanna

Leave It to Bieber

3/4/2010 2:05 AM PST BY TMZ STAFF
Here's pop diva Rihanna in Berlin on Wednesday (left) -- and teen pop divo Justin Bieber in NYC back in October (right).

Rihanna and Justin Bieber
Only one of them had a hit album called "Good Girl Gone Bad."

We're just sayin'.