Just two weeks after competing in a 5k run as a part of the Blenhim Triathalon, Pippa Middleton was back pounding the pavement this weekend.

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Kate Middleton's younger sister arrived in style aboard a helicopter to the starting line of the Highland Cross 2011 -- a 50 mile duathlon which takes place in the idyllic Scottish Highlands.

The 27-year-old completed the 20-mile run and 30-mile bike ride on Saturday as part of the team Affric Brats.

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Wearing an all black outfit, Pippa showed off her lean and toned body, not appearing to break a sweat as she made her way toward the finish line with a smile on her face.

Her sister, The Duchess of Cambridge, and Prince William are due to arrive in the United States at the beginning of July for their first official tour since their wedding in April and Pippa is rumored to be joining them.

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The Duchess of Cambridge -- aka Kate Middleton -- is sure to be taken to task by fashionistas for wearing the same hat to two back-to-back events Saturday.

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Just a couple of hours after Prince William's bride appeared at an event honoring Queen Elizabeth, she and her sister Pippa met up for a friend's wedding.

And while Kate did a quick change out of the ivory-colored suit she wore to the Trooping the Colour ceremony in the morning into a sweet back and white dress for the afternoon wedding, her black hat stayed in place.

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The Duchess and her now famous sister both actually both wore black headpieces and matching smiles as they were snapped arriving at the wedding in Berkshire, England.

And the day no doubt held a special place in the royal's heart.  The friend getting married, Sam Waley-Cohen, was the man credited for saving her romance with Prince William after their brief split in 2007.

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Who knew cell phone companies had a sense of humor?  T-Mobile is using their comic version of the upcoming wedding of Prince William to Kate Middleton as part of their Life's for Sharing ad campaign.

The video stars look-alike performers for all your favorite royals, including Queen Liz, dancing down the aisle of a giant cathedral.

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The dancing Harry almost steals the show from the bride and groom, even though William does a first class leap frog over his bro.

Watch it and laugh.

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Prince William & Kate Middleton need look no further than their own TV sets tonight to get a primer on royal weddings. TLC is airing a special called William, Kate and 8 Royal Weddings, and you can see a preview right here on RadarOnline.com.

From Charles and Diana and Andrew and Fergie, right back to Elizabeth and Philip, the show takes a look at the glamour and spectacle of British royal weddings, and why people around the world are fascinated by them.

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William and Kate have only until April 29 to get all their plans in place, but they got a bit more practice at the whole wedding thing Saturday when they attended the nuptials of their friends Sarah Stourton and Harry Aubrey-Fletcher.

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Prince Harry and Princess Beatrice (daughter of Fergie and Andrew) were also there for the service at St. Andrew's Church in North Yorkshire. England.  Kate was dressed in a black velvet coat -- all the better to show off her dazzling sapphire engagement ring.

William, Kate and 8 Royal Weddings airs Sunday night on TLC.

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