Gaga to wear Armani on world tour

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Remember Gaga’s galactic Armani getup at last year’s Grammy Awards? Well there’s more where that came from. Giorgio Armani will be designing the pop-star’s wardrobe for her upcoming Monster Ball tour, kicking off in February 2011. He’s said to be whipping up costumes that will include leather, mirrors, and even ribbons for a lobster-inspired effect. But Gaga’s not the only celeb to team up with a couture designer this week. Gossip Girl beauty Blake Lively is reportedly set to star in an upcoming Chanel ad campaign, featuring the French fashion house’s new handbag collection.  –Shanelle Kaul