Harry and his bride-to-be Meghan were also absent as the couple has their personal plans somewhere else, according to the palace officials.
The Duke and Duchess of Cambridge arrived late for the Easter church service at Windsor - turning up after the Queen had already gone in.
The Queen was presented with posies by Madeline Carleston and Amelia Vivian, two six-year-old girls whose parents work and live in the castle, when she arrived.
The Duke and Duchess of Cambridge joined the Queen and a host of other royals for the Easter Mattins Service at St George's Chapel in Windsor - where Meghan Markle and Prince Harry will marry on May 19. Last summer, he stepped down from public duties, the paper wrote.
However, what is more intriguing is that the new addition to the royal family will be born a commoner, even though it will be given an impressive title. The Royal Collection Trust website explained this tradition began in the Middle Ages when English monarchs gave money and gifts to the poor on Maundy Thursday.
When it was announced past year that he would be retiring from official engagements, Buckingham Palace stressed that the decision was not health-related and he had the full support of the Queen. Children made their own baskets before hunting for eggs hidden in the Royal Mews, according to the Royal Family website.
The Duchess, who is expected to give birth to her third child this month, is now on maternity leave. No details were announced about whether the family would continue the tradition this year.