1 for the fifth straight week.

Again, toBruno Mars dismay, B.o.Bs Nothin On You sits at No.

And Trains Hey, Soul Sister remains at No.

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Credit: Johnson: Hilary Walsh

6 and 7, respectively.

Moving on up is Taio Cruzs Break Your Heart, which jumped up two spots to No.

4.Usher, whose OMG debuted at No.

14 last week, climbed into the last spot on the top 10.

Its the 15th top 10 cut of his career.

New entries to the top 20 includeJay-Zs Young Forever, at No.

17,Ke$has Your Love is My Drug at No.

19, andJack Johnsons You and Your Heart, which debuts at No.

Pop princess Rihanna continues to dance at the top, but theres plenty of new blood this week.

Who do you think will challenge her?

Broadway star Laura Bell Bundy kicks off her crazy country career: A Music Mix Q&A