Inside the Best Parties of Men's and Couture Fashion Week

Best Parties - Olivier Rousteing and Lewis Hamilton - January 21, 2017 - SLIDE

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What's picturesque, romantic, and chic all over? The City of Love, my friends.

That's where the most insider-y of fashion insiders spent their week for a) the spring 2017 menswear shows b) Paris Couture Fashion Week or c) both. Tilda Swinton lent her sleek, modelesque aesthetic to the camera at a celebration of Berluti Creative Director Haider Ackermann's latest collection for the boys, where the designer looked dapper in a sleek sports jacket and Swinton shone with her signature bold red lip.

The word party doesn't start contain a 'B,' but it may as well considering Balmain never fails to host a bash that defines fun. The fashion house's Olivier Rousteing celebrated his collection at El Pompon Magnifico, where he welcomed an exciting mix of notables which included photographer Ellen von Unwerth, model Grace Bol, race car driver Lewis Hamilton, and Sofia Richie. If the boys of Paris were in search of a golden ticket, all treasures lead to Balmain.

Of course, we can't forget the world of couture. Following Dior's magnificent runway show, Dior Beauty ambassador Bella Hadid grabbed her troops and spent the evening at Dior's masquerade ball, where she #nailedit in a sheer pastel blue number alongside Kendall Jenner, also in sheer and also sporting a fresh set of micro bangs.

The celebrity sightings weren't few at the Sundance Film Festival, where Lily Collins happily promoted To the Bone from one screening to the next.

RELATED: 9 Celebrity Hair Makeovers of 2017

Scroll down for the hottest parties of this week.

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Sofia Richie

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at Balmain's spring 2017 menswear after-party.

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Cindy Bruna

Victor Boyko/Getty

at Balmain's spring 2017 menswear after-party.

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Grace Bol

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at Balmain's spring 2017 menswear after-party.

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Ellen von Unwerth

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at Balmain's spring 2017 menswear after-party.

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Zoey Deutch

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at Park City Live resents The Hub at the 2017 Sundance Film Festival.

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A$AP Rocky and Bella Hadid

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at Dior's Bal Masque Party.

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Kendall Jenner and Bella Hadid

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at Dior's Bal Masque Party.

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Alexandre Vauthier and Bella Hadid

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at Swarovski's Alexandre Vauthier cocktail and dinner party.

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Lily Collins

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at AT&T's The Lift at the 2017 Sundance Film Festival.

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Tilda Swinton and Haider Ackermann

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at Berluti's spring 2016 after-party.

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Natalia Vodianova and Marisa Berenson

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at Berluti's spring 2017 after-party.

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Alfre Woodard and Elle Fanning

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America Ferrera

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at AT&T's The Lift at the Sundance Film Festival.

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Star Studded: Best Parties This Week

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Sofia Richie

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Cindy Bruna

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Grace Bol

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Ellen von Unwerth

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Zoey Deutch

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A$AP Rocky and Bella Hadid

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Kendall Jenner and Bella Hadid

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Alexandre Vauthier and Bella Hadid

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Lily Collins

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Tilda Swinton and Haider Ackermann

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Natalia Vodianova and Marisa Berenson

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Alfre Woodard and Elle Fanning

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America Ferrera

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