Michelle Obama, Samantha Cameron
Alex Wong/Pool/Sipa
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State Dinner

Samantha Cameron opted for a three-quarter sleeve lace dress by London-based designer Alessandra Rich for the White House State Dinner, while Michelle Obama chose a teal, off-the-shoulder Marchesa gown and layered Tom Binns necklaces. Marchesa designers Georgina Chapman and Keren Craig are both British, while the label is run out of New York. Now that's diplomatic!

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