Buzz Bites (4/11/11): Nicki Minaj Joins Britney Spears On Upcoming Tour

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+ After Enrique Iglesias pulled out of Britney Spears' upcoming concert tour, Nicki Minaj has been slated to take his place. Craziest. Costume changes. Ever. (ONTD)

+ Gucci Mane was arrested on Friday and charged with a misdemeanor after pushing a woman out of a moving vehicle when she allegedly refused to go to a hotel with him. (MTV News)

+ Stop the presses!!! Lady Gaga was spotted out and about wearing...jeans!!!!! (Buzzfeed)

+ Holy pop stars, Batman. Britney Spears is collaborating with Rihanna on an upcoming remix of "S&M." (Neon Limelight)

+ Speaking of collaborations, here's another we didn't see coming -- Chris Brown and Joe Jonas teamed up in the studio recently and reportedly wrote a "smash hit" together. (Rap-Up)