Lady Gaga
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The business of being Lady Gaga

Michelle Fleury meets Lady Gaga and talks to her about her latest business ventures.

Lady Gaga's new track Born This Way is officially the fastest selling single ever on iTunes.

But the singer is also a savvy business woman. With an army of more than eight million Twitter followers, she understands digital media better than most and has arguably taken product placement and marketing tie-ups to a new level.

Her latest venture is with Mac to promote a range of cosmetics which helps fund Aids research. Michelle Fleury in New York went to meet her.