William stopped for a pint of Guinness during the celebration, while Middleton stuck to water.
ET breaks down all the latest updates from Meghan and Harry ahead of their May 19 nuptials!
A source also tells ET the royal family is 'embracing' the bride-to-be.
Monday's Commonwealth Day service held at Westminster Abbey marked the former 'Suits' star's first official appearance with the queen.
The proud dad revealed on Tuesday that his 4-year-old son is 'obsessed' with the police.
The couple was captured sharing a sweet moment during the live broadcast.
The former 'Suits' star gave off major bridal vibes while stepping out to the Commonwealth Service on Monday, her first official public event with Queen Elizabeth II.
They were joined by Prince Harry, Kate Middleton, Prince William, Prince Charles and more.
ET breaks down all the latest updates from the couple ahead of their May 19 nuptials!
The Duchess of Cambridge is eight months pregnant with her third child.
Middleton's due date for baby number three is fast approaching, but that hasn't stopped the Duchess from doing her royal duty.
The Duchess visited a primary school in Oxford, England.
But she still looked fabulous!
