Kate Middleton Strolls On The Slopes, While Princes William & Harry Ski

Pregnant Kate Middleton enjoyed some alone time Sunday, walking by herself in the Swiss Alps, and we've got the shots for you right here on RadarOnline.com.

The Duchess of Cambridge, who's due to give birth this summer, showed off a bigger baby bump, clad in sunglasses, black skinny jeans and a patterned maternity top as she walked while three royal security guard trailed the lovely lady.

"She was walking down the hill with three men," an eyewitness told Mail Online. "She was very sweet and smiled at people who looked at her … she seemed to be taking in the scenery."

The 31-year-old beauty and her husband this weekend attended the wedding of equestrian Laura Bechtolsheimer and polo player Mark Tomlinson, both sporting celebs in the U.K. Prince William served as an usher at the affair.

On Monday, Will went skiing with his brother, Prince Harry, and in style: Kate's hunky hubby wore a black helmet and goggles, while Harry went with a louder look, teaming a red jacket with sleek, reflective sunglasses.