updated 02/19/2013 AT 10:30 AM ET
•originally published 02/19/2013 AT 8:25 AM ET
Making her first official public appearance since her Caribbean babymoon, a tanned and healthy-looking Duchess of Cambridge showed off her blooming baby bump Tuesday morning during a visit to a residential treatment center run by one of her patronages, Action on Addiction.
Just back from a winter break in Mustique, Kate, 31, chose a gray MaxMara Studio dress paired with pearl drop earrings.
“She looked really relaxed and rested after her break. She could have worn a coat, but she looked happy to show off her bump,” says Judy Wade, the royals writer for the Observer.
“It’s nice to be back,” Kate said as she greeted Action on Addiction’s chief executive, Nick Barton. “It’s a lovely day for it.”
Kate also acknowledged how she felt about having a baby as she chatted with those at the center.
Said Lisa, 34, a mother of three: “I asked her if she was nervous about having a child, and she said it would unnatural if she wasn’t. It’s just human, isn’t it?”
Another woman, Natalie, 28, is carrying a baby due in late July, and said after speaking to Kate, “She was saying she had been feeling unwell but was feeling better now.”
Next month, the Palace is set to make an announcement on another group of charities and interests that Kate will support.