The NY Pre-Parties

Gossip Girl

's Penn Badgley kicked off fashion's night out at the Lacoste L!VE event at The Rose Bar in New York City. Jeremy Piven was also on hand for the party, which featured a live performance by Sleigh Bells, dancing and cocktails.

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star Thandie Newton (in Stella McCartney) and Giorgio Armani kept Fashion's Night Out going across the pond at Armani in London.

Claudia Schiffer

(in Christopher Kane), Gwyneth Paltrow and Natalia Vodianova were also out in London to attend Fashion's Night Out at Stella McCartney.

"Look who I ran into!" tweeted designer Michael Kors, after catching up with Blake Lively (in Marchesa) at Fashion Night's Out: The Show, held at Avery Fisher Hall in New York City. Kors' plan for Fashion Week? "My #FashionWeek survival tip: patience, laughter and good music to keep us working all nite!"

Vera Wang

and Francisco Costa were among the designers who watched their pieces come down the ring-shaped runway at Fashion's Night Out: The Show, which is scheduled to air on CBS on Sept. 14.

Supermodels like Naomi Campbell, Gisele Bundchen, Karolina Kurkova and Chanel Iman crowded around singer Pharrell as he gave a memorable performance from atop a double-decker bus during Fashion's Night Out: The Show.