The Duchess of Cambridge is nearing the end of her maternity leave and is set to resume royal duties in June. It is believed that Queen Elizabeth II wants Kate Middleton to be present during her birthday parade June 13.

According to OK UK, Kate Middleton will return to attending public engagements next month -- just weeks after giving birth to Princess Charlotte. The Duchess’ maternity leave this time is reportedly shorter than her 39-day leave after having Prince George in 2013.

A source close to the royals said that the queen “thinks a month is more than enough time for Kate to take off before she should return to performing her royal duties.” The source adds, "It's a huge public event, an incredible pageant carried out by the queen's personal troops. Kate will be on show for it, dressed up in a smart outfit, with the eyes of the world on her."

Kate shouldn’t have any problems returning to her royal duties earlier than anticipated. As previous reports suggested, the royal children’s grandparents, Carole and Michael Middleton, are always ready to give their daughter a hand when it came to looking after their grandchildren.

Meanwhile, Prince William has already reported back for work and resumed his royal duties, as reported by Hello Magazine on May 19.  His first working week away from Princess Charlotte, Prince George and Kate included a trip to Switzerland to attend a series of meetings for the United for Wildlife movement -- a foundation he created with Kateand brother Prince Harry.  He also visited the England women’s soccer team last week as a send-off to the Lionesses, who will participate in the upcoming FIFA Women's World Cup in Canada.

The Duke of Cambridge also led the celebration for conservation charity Tusk Trust at his grandmother Queen Elizabeth's castle, People reported. Tusk Trust is one of William’s favorite charities: He has said how proud he is to be Royal Patron for Tusk Trust, a position he’s held for 10 years. The charity, led by CEO Charlie Mayhew, raised 25 million pounds ($38.4 million)  in 25 years in support of more than 100 projects, not only protecting 36 endangered species but also building and refurbishing 30 schools.