Kate wore a $1,200 blazer by Philosphy Di Lorenzo Serafini.
As before, the coming of the mother of prince George and princess Charlotte of Cambridge had not been scheduled nor announced: "She is doing better and wants to do as much as possible, but it decides day to day what she is capable of doing", commented a staff member of the royal city by the site of the Hello magazine. But she's taking it day-to-day in deciding what she can do'.
For her latest outing, she opted for a more casual look.
Apprentices from all over the United Kingdom were honoured at West Ham's football stadium - the former Olympic stadium in London. Five years ago, the royal trio set up the Coach Core program on the eve of the 2012 London Games. By training young people as sports coaches, the program encourages them to be positive role models and mentors in their communities, too.More news: Prince William and Kate Middleton have announced a due date
More news: Erdogan: Turkey backing FSA rebels in new Idlib push
More news: New rules expand list of employers that can deny coverage for contraceptives
The brunette beauty - who concealed her tiny bump underneath a blue suit - appeared to be in good spirits as she spoke with the young people who had completed the Coach Core scheme, which is created to teach apprentices, aged between 16 and 24, technical sports skills alongside coaching.
Ahead of the ceremony, Harry and William will watch some practical sessions in action, with a number of different sports being played.
The event gave Kate, William and Harry the chance to meet with 150 apprentices who have graduated from the Coach Core mentoring programme.
There is also a chance that the birth of the baby will coincide with the Royal couple's anniversary on April 29 if the newest prince or princess arrives later in April. While at the Coach Core graduation, Will talked to recent swim coach grad, Alex Ferrier.