Letter Z artists.

Zablujena Generacija
Zacarias Ferreiras
Zakk Wylde & Black Label Society
Zao
Zappa Frank
Zaza Mama
Zazie
Zdravko Colic
Zebda
Zebrahead
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Music News

On "Baby," Bieber is usually joined by Ludacris, but for this version, the crooner takes over Luda's part and spits the rhyme himself. Though Bieber has told MTV News that he has no plans to get into the rap game — even though he chills with guys like Luda, Diddy and Drake — his MCing skills aren't half bad.

In an interview with Ryan Seacrest earlier this week, Gaga discussed some of the video's pop-culture references, namely the Coca-Cola cans she wears in her hair (like the ones she recently sported in Sydney). "My mom used to do that when I was a kid," she explained. " 'Cause if we didn't have any rollers in the house, she'd slice up some Coke cans and then she'd heat them up and pin them in her hair."

"We didn't dictate, we just asked nicely," Nicki smiled.