Kate Middleton Flaunts Pregnant Baby Bump Walking Through Snow in Swiss Alps

USMagazine, Monday, March 4, 2013, 6:30am (PST)

Kate Middleton may be staying active during her first-ever pregnancy -- but, thankfully, she declined to go downhill skiing with husband (Prince William and brother-in-law Prince Harry in the Swiss Alps on Sunday, March 3. One day after the three royals bundled up in daytime formal wear for the wedding of athlete pals Laura Bechtolsheimer and Mark Tomlinson, the pregnant Duchess, 31, went for a much more casual look for a walk through the stunning mountainside at the Arosa resort in Switzerland.

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In one of the most pronounced shots yet of the expectant royal's transforming shape, Middleton braved the cold in a short sleeve loose print blouse that gave a glimpse of her growing baby bump plus black skinny jeans and black snowboots. Bearing a striking resemblance to little sister Pippa, Kate kept a serene expression behind sunglasses, with her brown hair held back with a clip.

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"She was walking down the hill with three men. She was very sweet and smiled at people who looked at her. She seemed to be taking in the scenery," a German tourist told the Daily Mail.

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William, 30, and Harry, 28, meanwhile, were spotted skiing down the slopes that same day. For Saturday's wedding ceremony, the Duchess wore a cream coat with brown fur trim and brown hat (by Lock & Co) plus a MaxMara dress, Emmy shoes and clutch. After the couple exchanged their vows at the chapel, Kate was seen outside "throwing white confetti in the air and laughing with joy," an onlooker told Us.

This article originally appeared on Usmagazine.com: Kate Middleton Flaunts Pregnant Baby Bump Walking Through Snow in Swiss Alps