Bey was her usual flawless self last night at the 40/40 Club 10 Year Anniversary Party. Mrs. Carter choose this white knit Roberto Cavalli hotness for her hubby's soirée and stunned.

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After I take a second to point out that those cut outs are working on every level, I would also just like to say, I'm obsessed with Beyonce's super-straight strands here. Love when she does this look—so gorge!

See Beyoncé's Gorgeous Roberto Cavalli Gown for the Mrs. Carter Show World Tour

What do you think of B's dress and sleek 'do? Are you a fan? Sound off in the comments below or on Twitter @OKMagazine.

Beyoncé in Stripes at Kanye's Birthday Party

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