Gwen Stefani and Katy Perry Partied Together

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The week's parties started off right on Monday, when Karlie Kloss spent a school night hanging out with Jerry Seinfeld. A few days later in L.A., Jennifer Aniston and Tobey Maguire hosted a dinner for jewelry designer Jennifer Meyer, where Gwen Stefani and Katy Perry hung out and January Jones wore a leopard onesie. Back in New York, Bloomingdale's unveiled their holiday windows for a crowd including Queen Latifah and Jane Krakowski, and the next night, Gigi Hadid and Kris Jenner spent time together at a jewelry launch in West Hollywood, sans Kendall or Kylie.

Click ahead to see those moments and more from this week, including Chloë Sevigny in hot pink ruffles, Diane Kruger in poofy Chanel, Simon Doonan and Kyle MacLachlan with a polar bear, and Alice + Olivia's Stacey Bendet surrounded by babies. 

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