From Bradley Cooper and Lady Gaga at Toronto Film Festival to New York Fashion Week, there was a lot happening with the rich and famous this week! Here's what some of your favorite celebs were up to.

The Hadid Sisters wowed on the runway with each other and with the support of their parents, while Katy Perry showed off her new lime green pixie cut while on tour. Check out a few bonus photos at the end of our gallery.

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