This week was truly a celebration — and any excuse would do! Whether it was Rachel Zoe and Brian Atwood's Summer vacation, Karlie Kloss and Jourdan Dunn's birthday, or the occasion of seeing Beyoncé live in concert as Prabal Gurung did, the style stars were living it up on Instagram. Click through to see this week's best shots, and don't forget to keep up with our editors by following us at popsugarfashion!
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Insta Glam: The Week's Best Instagrams From Our Favorite Fashion Insiders