Thursday, Sept. 17, Kate Middleton visits a children's mental health center in London. Kate is back in her public duty and was seriously dazzling - don't forget her fashion style.

She complemented her beautiful hairstyle, a cheek length bangs, with a black and white houndstooth Ralph Lauren silk "Austin" dress (don't ask me the price). And partnered the outfit with here Stuart Weitzman "Power" pumps and a Mulberry suede clutch.

The Duchess of Cambridge was previously spending the summer in their home in AnmerHall, Norfolk together with Prince George, age 2, and Princess Charlotte, 4 months.

Her Thursday visit to the Anna Freud Centre marks the first day of her return. She will be learning more about how the organization is helping to change mental health care for children and young people.

Kate arrived at the center at 11:30 am, she greeted the staff and went inside for a tour. In addition, after which, the 33-year-old royal will be going to the site of the planned Community Campus.

Included in her schedule is visiting The Family School, a charity sponsored by Anna Freud Centre and has over 60 years of experience of taking care of children suffering from serious emotional and behavioral problems.

The Duchess is feeling "refreshed and full of energy", a source told Us Weekly. The low-key and family-focused vacation really helped.

"This summer has been their quietest so far in terms of being able to just focus on family life and keep themselves tucked away out of sight," the source continued. "It was so nice to be able to go to Anmer after the birth of Charlotte and not be seen for a while."