Bieber ready to unveil a more mature sound

Justin Bieber, we know that you're very aware that it's always tough for teens who've had huge success as pop stars to cross over into successful adult careers. But we have full confidence that you're about to unveil a new grown-up Justin Bieber with a more mature sound when you release your new single, "Boyfriend," on March 26. Your vocal producer, Kuk Harrell, told HollywoodLife.com in an exclusive interview that when you're in the studio you're "all about business" and that he's working with you to allow you to "change from a little boy to a young man."

-- Bonnie FullerBonnie Fuller is president and editor-in-chief of HollywoodLife.com and the former editor of Star, Us Weekly, Glamour, Cosmopolitan and Marie Claire magazines.Singer's love dilemmaChris Brown has two lovely ladies pining for his attention, Karrueche Tran and Rihanna, and he can't seem to pick between them. The 22-year-old pop star went out to Tru Nightclub in Hollywood with his girlfriend, Karrueche, last week and seemed to be having the time of his life. They were smiling into each other's eyes as they got into their car and drove off.

Who do you think Chris Brown should date? Go to hollywoodlife.com and let us know.