Seth Rogen has been badmouthing his fellow Canadian for months, most recently explaining his animosity after a meeting backstage at a German talk show where Bieber requested a meeting and then apparently acted 'like a bit of a motherf---er." Bieber responded with a non-apology apology, tweeting "sorry i didn't bow down to you."
Courtney Love and former Nirvana drummer Dave Grohl have been feuding over the rights to Nirvana's music since Kurt Cobain killed himself in 1994. Though they hugged it out at the band's recent rock hall of fame induction, back In 2011, Courtney explained why she hates the Foo Fighters frontman. "Wh...
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