Kate Middleton is playing it cool during her pregnancy!

The royal mom-to-be spent a snowy weekend in the Swiss Alps and showed off her baby bump while watching Princes William and Harry go skiing, according to Us Weekly.

In what might be the most revealing look at her baby bump yet, Kate was photographed in a loose blouse with skinny jeans and black boots at a moutainside resort in Switzerland on March 3. 

To see the revealing photo of Kate braving the cold climate in her light clothing, click here.

"She was walking down the hill with three men," an onlooker says of Kate. "She was very sweet and smiled at people who looked at her. She seemed to be taking in the scenery." 

This comes one day after she got all dressed up in a cream coat with brown fur trim for her friend's wedding. 

At the wedding, Kate was seen "throwing white confetti in the air and laughing with joy," says a source.

We're impressed that Kate is still staying so active and even watching her hubby ski. If that were us, we'd be bundled up at the lodge with a mug of hot cocoa.

Source: Us Weekly