Sienna Miller's floral LBD at the Vanity Fair Tribeca Film Festival Party was girly-meets-grown-up in the best way possible last night. She paired the Topshop number with a Delvaux Madame colorblock bag and a vintage-inspired shoe for an effortlessly glam vibe that put her major legs on display.

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Sienna rarely has a fashion faux pas—the girl just looks good in everything. Her dress is available at Topshop stores for $130.

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What do you think of Sienna's LBD? Would you rock it? Sound off in the comments below or on Twitter with the hashtag #OKLookoftheDay!

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