The last time she was seen in public was at a charity polo match on Sunday, playing with her son Prince George, while her husband Prince William and brother-in-law Prince Harry took part in the game.
At the event Kate was wearing skinny jeans after just one month since Charlotte’s birth.
So what is her secret for a slender figure in such a short time? According to People, the Duchess, 33, has worked with a top trainer while she was pregnant, and she also had a healthy diet.
And for “an extra boost” of energy, Kate reportedly drinks green juices, delivered by her sister Pippa Middleton.
Catherine has always had an enviable figure.
For more about Kate staying fit visit People.