John Stillwell/PA/Landov
April 29, 2011 04:30 PM

The Duchess of Cambridge‘s regal Alexander McQueen wedding gown was, well, fit for a princess, but her second dress of the day – also a McQueen creation – was definitely meant for a party.

After a long day that started with hair and makeup at 6:30 a.m., wound into the hour-long ceremony and procession, featured two very public kisses and culminated with a Buckingham Palace reception for 650 hosted by the Queen, Kate found time to change before heading off to the second post-wedding bash of the day.

Following a brief rest at Prince Charles’s home, Kate slipped into another dress designed by McQueen creative director Sarah Burton: a white satin strapless evening gown with a circle skirt and diamante detailing around the waist. She topped the look with a simple white shrug, warming her up in the breezy 60-degree weather.

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Not to be outdone, The Duke of Cambridge pulled a quick change, too: William set aside his scarlet colonel uniform in favor of a dapper black tuxedo. Prince Charles, his wife Camilla Parker Bowles and Kate’s sister Pippa all stepped out in colorful new outfits, too.

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After regrouping, William and Kate returned to Buckingham Palace, where Prince Charles is throwing the couple – and 300 guests – a festive dinner dance. After spending their first night as newlyweds in the stately palace, they’ll likely jet off on their honeymoon on Saturday.

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