Michelle Obama Wears Oscar de la Renta to Lunch with Queen Elizabeth

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Queen Elizabeth's already-pretty-extravagant birthday week isn't even close to over, thanks to the arrival of President Barack Obama and First Lady Michelle Obama late last night. This afternoon, they'll lunch with the Queen and Prince Philip at Windsor Castle.

Barack and Michelle arrived via helicopter in Windsor this afternoon, after which the 94-year-old Prince Philip himself drove the foursome to the castle, where they'll have a private lunch.

According to one White House correspondent, Michelle is wearing two of her most trusted designers: a fuchsia and royal purple Oscar de la Renta dress and an iris wool pique Narciso Rodriguez coat, a customized version of this look from the fall 2015 collection, which is sadly no longer available. Those shoes, by the way, are Jimmy Choo's 'Aza' pumps in black patent leather (here they are in suede for $595).

Here's the coat, whose purple hue many are positing could be a tribute to Prince:

Photo: WPA Pool/Getty Images

As Racked previously reported, Barack and Michelle will later double date with Prince William and Kate Middleton, with good ol' Prince Harry acting as fifth wheel.